[ 0021 ] fig1 is an illustration of a print system 1 . fig2 is an illustration showing an example of a printer condition screen q 1 . the print system 1 is a part of an official action network which intercommunicatably connects a plurality of data processing devices including computers 11 , 12 and 13 , and provides four printers 31 , 32 , 33 and 34 and a print server 20 for collectively administrating the printers 31 to 34 . all the printers 31 to 34 are connected with a network cable 40 via the print server 20 . the printers 31 to 34 may incorporate a network interface card ( nic ) therein to be directly connected with the network cable 40 . the print server 20 may be either a device for exclusive use thereof or a multi - function device having both the server function and the client function . the printer server 20 may be incorporated in the printer 31 . a print spooler u 21 for administrating the schedule of the printers 31 to 34 as well as a job observation stationary module u 22 for grasping the use condition of the printers 31 to 34 are incorporated in the print server 20 . a status monitor u 10 for displaying the printer condition screen q 1 is incorporated in all the computers 11 to 13 as clients using the printers 31 to 34 . the job observation stationary module u 22 and the status monitor u 10 are characteristic utilities of the present invention , and link with each other to display the use condition of the printers 31 to 34 on real time . the printer condition screen q 1 in fig2 displays the operational condition ( status ) and the time required to complete a print job during printing or waiting for printing ( waiting time ) concerning all the printers 31 to 34 as a list . operators of the computers 11 to 13 are able to optionally change the display position of the printer condition screen q 1 on the display , and to close the window of the printer condition screen q 1 if unnecessary or desired . fig3 ( a ), 3 ( b ) and 3 ( c ) show the summary of the waiting time display . the case described hereinafter has two computers 11 and 12 as clients and only one printer is used . two print jobs are inputted to the print server 20 in the step of fig3 ( a ). for example , if the first print job during printing is expected to be completed after five minutes and the second print job waiting for printing is expected to require one minute , the waiting time is “ six minutes ”. use condition data dst including this waiting time is sent to the computers ( clients ) 11 and 12 from the print server 20 simultaneously , and the status monitor u 10 of each computer 11 and 12 displays “ six minutes ” as the waiting time . if the third print job is inputted by one computer 11 in the aforesaid state as shown in fig3 ( b ), the job observation stationary module u 22 of the print server 20 calculates the required time . if the calculated value is “ 3 minutes ”, the waiting time is “ nine minutes ”. the latest waiting time is simultaneously notified to the computers ( clients ) 11 and 12 , and the waiting time display of the printer condition screen q 1 is updated from “ six minutes ” to “ nine minutes ”. when the printing of the first print job is completed thereafter , the new waiting time (“ four minutes ”), obtained by deducing the time required for the first print job , is simultaneously used to update the contents of the printer condition screen q 1 as shown in fig3 ( c ). the waiting time does not need to be calculated by print job units . for example , the advancing condition of printing may be minutely observed by a predetermined page numbers unit to update the waiting time display one after another during the printing of one print job . with such a control , even in the condition that the great part of the print jobs are the ones of a large number of pages , the gap between the displayed waiting time and the actual waiting time is able to be minimized . however , it is to be noted that minute display update may cause overcrowding of the network . in the print system 1 , the print server 20 sends the use condition data dst to the clients that are physically and logically connected therewith . thus , when a computer is newly connected with the network , or when power is turned on , the corresponding computer must register with the print server 20 . the computers 11 and 13 are operating and the computer 12 is not operating in the step of fig4 ( a ). a client administration file f 1 is provided in the print server 20 , and the computers 11 and 13 during operation are registered thereto as clients . when the power of the computer 12 is turned on , the computer 12 , which newly starts operation , outputs a registration request signal rq 1 to the print server 20 as shown in fig4 ( b ). in response thereto , the print server 20 accepts the computer 12 as a client and updates the client administration file f 1 . thereafter , the use condition data dst is sent to the three computers 11 , 12 and 13 to display the printer condition screen q 1 of the same contents on all computers 11 to 13 . even in an oa network operating all day , the use of the printers 31 to 34 is mostly limited to a certain time slot during the day according to the convenience of a paper supplier and the like . namely , the power of the printers 31 to 34 are off during the night in general . accordingly , in some cases , not only the printers 31 to 34 but also the print server 20 do not operate . fig5 ( a ) shows the condition that the computers 11 to 13 are operating , but the printers 31 to 34 and the print server 20 are not operating . when the power of the print server 20 is turned on , the print server 20 outputs server registration request signals rq 2 to the network as shown in fig5 ( b ). in response thereto , each computer 11 to 13 outputs a registration request signal rq 1 to the print server 20 at an appropriate timing . the print server 20 accepts the computers 11 to 13 which output the registration request signal rq 1 , as described above , as clients , and writes client discrimination information to the client administration file f 1 . then , the use condition data dst is sent to the three computers 11 , 12 and 13 to display the printer condition screen q 1 of the same contents on all computers 11 to 13 . on this occasion , if the power of the printers are not turned on , the display showing that the printers are unavailable is displayed . when the status monitor u 10 is started by the operating system ( os ), the status monitor u 10 requests the client to register with the job observation stationary module u 22 of the print server 20 at first in step # 101 . then , the status of the network is observed in step # 102 , and the following procedure corresponding to the status is executed . if an acceptance response to the client registration request is outputted , the registration condition of the print server 20 is updated and the printer condition screen q 1 is displayed as a monitor screen in steps # 103 and # 104 . in the case that the server starts to operate later than the clients and the server registration request is outputted as described above , the client registration request signal is outputted in response to that request in steps # 105 and # 106 . when the use condition data dst is received by the clients , the contents of the printer condition screen q 1 are updated in steps # 107 and # 108 . if a request is sent from a client to remove the client from the system , the registration in the print server 20 is deleted in steps # 109 and # 110 . when a completion operation for designating shutdown of the power source is performed , client registration delete request is outputted to complete the process in steps # 111 and # 112 . when the job observation stationary module u 22 is started by os , it outputs the server registration request rq 2 at first in step # 201 . then , the status of the network is observed in step # 202 , and the following process corresponding to the event is executed . if client registration request rq 2 is outputted , the client administration file f 1 is updated to notify the effect of the acceptance to the status monitor u 10 in steps # 203 and # 204 . when a print job is received , the time required for printing is calculated and the print job is transferred to the print spooler u 21 to simultaneously notify the use condition in steps # 205 to # 208 . in calculating the time required for printing , a data base is used which is prepared in advance and which specifies processing time for every page description . as to image data such as text data or bit map data , the required times for every data size unit are added up . when the notification of the completion of one print job is received from the print spooler u 21 in step # 209 , the completed print job is excluded from the required time calculation to calculate the required time again in step # 210 , and the calculation result is simultaneously notified to the clients which are physically and logically connected and in the log - in state in step # 211 . if the client registration delete request is outputted , the registration of the corresponding client is deleted in steps # 212 and # 213 . if the completion operation for designating the shutdown of the power source is executed , the server registration delete request is outputted to complete the process in steps # 214 and # 215 . in the aforesaid embodiment , a plurality of print servers 20 may be provided to divide the administration of the printers 31 to 34 . in this case , only the servers 20 which output the server registration request accept the client registration request of the computers 11 to 13 which responds to the server registration request , and the other printer servers 20 ignore the client registration request . the number of clients and the number of printers are not limited to those of the embodiment . although the present invention has been fully described by way of examples with reference to the accompanying drawings , it is to be noted that various changes and modifications will be apparent to those skilled in the art . therefore , unless such changes and modifications depart from the scope of the present invention , they should be construed as being included therein .