fig1 is a diagram illustrating a server device as an information processing apparatus according to the first embodiment of the application . a server device 100 is connected to a plurality of ( herein , two ) client devices 10 a and 10 b through a communication channel 20 . the communication channel 20 is , for example , a network such as a lan ( local area network ). the number of the client devices connected to the server device 100 is not limited to two , but may be three or more . the server device 100 includes a port 110 as a communication unit , an information transmission controller 120 , an apparatus information obtaining unit 130 , and an apparatus h / w ( hardware unit ) 140 . the apparatus h / w 140 is illustrated as one block in fig1 , but the apparatus h / w 140 may be widely distributed to several parts of the server device 100 , and may include , for example , a temperature sensor , a fan rotation speed sensor , a voltage sensor , a current sensor , or other types of various sensors . moreover , the information transmission controller 120 includes an information storage unit 121 that stores apparatus information , as will be described later . the apparatus information obtaining unit 130 collects and obtains the apparatus information containing measurement information or several types of hardware information collected by sensors from the apparatus h / w 140 that is widely distributed to several parts of the server device 100 as above . the port 110 is a communication interface such as a lan card that performs communication between the client devices 10 a and 10 b . the information transmission controller 120 is placed between the port 110 and the apparatus information obtaining unit 130 . the information transmission controller 120 includes the information storage unit 121 in which the apparatus information received from the apparatus information obtaining unit 130 is stored . when the port 110 receives an information transmission request from one of the client devices 10 a and 10 b , the information transmission controller 120 controls the port 110 to transmit the apparatus information corresponding to the information transmission request . the port 110 transmits the apparatus information corresponding to the information transmission request to the client device that transmitted the information transmission request . here , the client devices 10 a and 10 b transmit the information transmission request , which is a request for transmission of the apparatus information displayed first on a state monitoring screen for monitoring the system or state of the server device 100 , to the server device 100 at constant intervals ( for example , at intervals of 30 seconds ). here , it is assumed that the client device 10 a transmits the first information transmission request at an earlier timing than the client device 10 b . here , only the information transmission request transmitted from the client device 10 a will be described . when the information transmission request transmitted from the client device 10 a is received at the port 110 , the information transmission controller 120 requests the apparatus information obtaining unit 130 to obtain the apparatus information , thereby obtaining the apparatus information from the apparatus information obtaining unit 130 . the information transmission controller 120 stores the obtained apparatus information in the information storage unit 121 , and controls the port 110 to transmit the apparatus information to the client device 10 a . when the apparatus information is stored in the information storage unit 121 , in cases where the apparatus information displayed on the same state monitoring screen exists in the information storage unit 121 , new apparatus information is stored instead of that apparatus information by performing a overwriting or the like . when a next information transmission request is transmitted from the client device 10 a , in a similar manner , the information transmission controller 120 requests that the apparatus information obtaining unit 130 obtains the apparatus information again , thereby obtaining the apparatus information from the apparatus information obtaining unit 130 again . the information transmission controller 120 stores the re - obtained apparatus information in the information storage unit 121 , and controls the port 110 to transmit the re - obtained apparatus information to the client device 10 a . by repeating the processes described above , a state displaying screen in which the apparatus information is stored is displayed on the client device 10 a , and the apparatus information in the state displaying screen is updated at constant intervals ( for example , at intervals of 30 seconds ). here , the client device 10 b also repeatedly transmits the apparatus - information transmission request , which is a request for transmission of the same apparatus information as the client device 10 a requested , to the server device 100 at constant intervals ( for example , at intervals of 30 seconds ). once the information transmission request from the client device 10 b is received at the port 110 , the information transmission controller 120 refers to the information storage unit 121 . in the information storage unit 121 , the apparatus information obtained when the immediately preceding information obtainment request from the client device 10 a was received is stored . then , the information transmission controller 120 reads the apparatus information stored in the information storage unit 121 without newly obtaining the apparatus information containing the status of the sensor of each unit in the server device or the like , and controls the port 110 to transmit the apparatus information to the client device 10 b . as described above , every time the information transmission request is received , the apparatus information stored in the information storage unit 121 is transmitted from the port 110 to the client device 10 b without newly obtaining the apparatus information containing the status of the sensor of each unit in the server device or the like . accordingly , in a similar manner as the client device 10 a , the apparatus information updated at constant intervals ( for example , at intervals of 30 seconds ) is displayed on the state monitoring screen of the client device 10 b . as described above , according to the server device 100 of fig1 , the apparatus information is newly obtained in response to the request from the client device 10 a . on the other hand , the apparatus information is not newly obtained in response to the request from the client device 10 b , and the stored apparatus information is transmitted . in this case , the process of obtaining the apparatus information is reduced by one - half compared with the case in which the apparatus information is newly obtained for all the information transmission requests from both of the client devices 10 a and 10 b . accordingly , the load for obtaining the apparatus information is reduced . fig2 is a diagram illustrating a server device according to the second embodiment of the present application . four client devices ( web clients a to d ) are connected to a server device 200 through a communication channel such as a lan . the server device 200 includes a web server 210 , a visual display controller 220 , a session management unit 230 , an apparatus h / w management unit 240 , and an apparatus h / w 250 . when the configuration of fig2 is compared with the first embodiment of fig1 , the web server 210 corresponds to the port 110 , and the combination of the visual display controller 220 and the session management unit 230 corresponds to the information transmission controller 120 . in particular , the web server 210 is a service function realized by http ( hyper text transfer protocol ). moreover , the information storage unit 221 in the visual display controller 220 corresponds to the information storage unit 121 . furthermore , the apparatus h / w 250 corresponds to the apparatus h / w 140 . in the session management unit 230 , the information that specifies the screen being displayed on each of the web clients a - d , and the information for the same screens that specifies the client device on which the screen is displayed first ( this will be referred to as a “ primary session ”) are stored . the visual display controller 220 can recognize the screen that is being displayed on the each web clients a - d and which of the web clients a - d is responsible for a primary session by referring to the session management unit 230 . the differences between the server device 200 of fig2 and the server device 100 of fig1 are described above , and the operations of the web server 210 , the apparatus h / w management unit 240 , and the apparatus h / w 250 are the same as the operations of the port 110 , the apparatus information obtaining unit 130 , and the apparatus h / w 140 of the server device 100 of fig1 . in other words , the web server 210 is responsible for the communication with the web clients a - d . the apparatus h / w management unit 240 accesses the apparatus h / w 250 to obtain the apparatus information that indicates the status of the server device 200 . the apparatus h / w 250 includes several types of sensors , and in response to the access from the apparatus h / w management unit 240 , the apparatus h / w 250 makes the apparatus h / w management unit 240 obtain the measurement information collected by those sensors and the apparatus information composed of the information on the hardware that constitutes the server device 200 . fig3 is a flowchart illustrating the processes performed by the server device 200 of fig2 . when a status display request is issued by one of the web clients a - d and the web server 210 receives the status display request ( s 1 ), the web server 210 transfers the status display request to the visual display controller 220 ( s 2 ). here , the “ status display request ” corresponds to the “ information transmission request ” received at the server device 100 according to the first embodiment of fig1 . regarding the term “ status display request ”, the fact that a state displaying screen in which the apparatus information is stored is displayed on each of the web clients is taken into consideration . next , the visual display controller 220 makes an inquiry to the session management unit 230 to determine whether or not the web client that has transmitted the presently - received status display request is a primary session in which the state monitoring screen corresponding to that status display request is displayed first ( s 3 ). when it is determined that the web client is a primary session , the visual display controller 220 requests the apparatus h / w management unit 240 to obtain the apparatus information ( s 4 ). the apparatus h / w management unit 240 accesses the apparatus h / w 250 to obtain the apparatus information that indicates the status of the server device , and passes the obtained apparatus information to the visual display controller 220 ( s 5 ). the visual display controller 220 converts the obtained apparatus information into the screen information that indicates a screen on which the apparatus information is displayed , and retains the apparatus information that has been converted into the screen information in the information storage unit 221 ( s 6 ). next , the apparatus information is returned to the web client responsible for the primary session that has presently transmitted the status display request ( s 8 ). when the web client is determined to be a non - primary session in step s 3 , the apparatus information stored in the information storage unit 221 is obtained ( s 7 ), and the obtained apparatus information is returned to the web client for the non - primary session that has presently transmitted the screen display request ( s 8 ). here , when a status display request for another state monitoring screen is transmitted from the web client that is responsible for the primary session , the information of the primary session about the previous state monitoring screen , which was stored in the session management unit 230 of fig2 previously , is reset . then , when a next status display request for that state displaying screen is transmitted , the web client that transmitted the status display request is recorded by the session management unit 230 as a new primary session . fig4 is a timing chart illustrating the operation of the server device of fig2 and 3 . here , the three web clients a - c out of the four web clients a - d transmit new status display requests for every refresh interval of 30 seconds , and the remaining one web client d transmits a new status display request for every refresh interval of 60 seconds . moreover , here , the same state displaying screen on which the entire apparatus information of the server device 200 is recorded is displayed on the four web clients a - d as an initial screen . here , it is assumed that the web client a initially transmits a status display request for the state displaying screen , and that the status display request is received at the server device 200 . in other words , here , the web client a is responsible for the primary session . in this case , in response to the status display request transmitted from the web client a , the apparatus h / w is accessed by the apparatus h / w management unit , and the apparatus information is newly obtained . in response to the status display requests transmitted from the other web clients b - d , the apparatus h / w is not accessed to newly obtain the apparatus information , and the apparatus information retained by the visual display controller is returned . fig5 is an operation timing chart of a server device as a comparative example . the operating condition in the operation timing chart of fig5 is the same as the operating condition in the operation timing chart of fig4 except that a primary session is not distinguished from a non - primary session . in the case of the server device of fig5 as a comparative example , the apparatus h / w is accessed to newly obtain the apparatus information in response to the status display request transmitted from any of the web clients a - d . if fig4 is compared with fig5 , it should be apparent in the case of fig4 that the apparatus h / w is not newly accessed for a non - primary session , and thus the load for obtaining the apparatus information is greatly reduced . in the description above , in cases where there are several types of state monitoring screens , it was assumed that a primary session was set for each of the several types of state monitoring screens . however , a primary session may be set for a portion of these several types of state monitoring screens . for example , only the first - displayed state monitoring screen for monitoring a state of the server device may be processed in the way of fig3 and 4 where there are a primary session and a non - primary session . it is often the case that the first - displayed state monitoring screen is displayed on the web clients a - d for a long time , and thus the load on the server device will be greatly reduced even if only the first - displayed state monitoring screen is processed as above . if the load on the server device is reduced , available throughput increases , and thus for example , it is possible to increase the number of the web clients that can be simultaneously connected . moreover , the amount of the reduced load may be allocated to the original task of the server device . all examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art , and are to be construed as being without limitation to such specifically recited examples and conditions , nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention . although the embodiments of the present invention have been described in detail , it should be understood that the various changes , substitutions , and alterations could be made hereto without departing from the spirit and scope of the invention .