To make it possible to perform efficient calculation on large-scale data that cannot be collected at one place or data updated momently. An information processing system 100 includes a plurality of computers 220 having a graph structure as a model, the graph structure being formed by a plurality of vertices corresponding to events as objects of analysis and an edge connecting the corresponding vertices to each other according to relation between the corresponding events, the plurality of computers 220 corresponding to the respective vertices and being connected to each other so as to be able to send and receive data in correspondence with the edge. Each of the computers calculates the transition probability of identifier data between the computer and the computer corresponding to the adjacent vertex connected by the edge, by a predetermined algorithm based on the numbers of pieces of identifier data retained by the mutual computers, and updates the numbers of pieces of identifier data retained by the mutual computers according to a result of the calculation.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. An information processing system comprising: a plurality of computers having a graph structure as a model, the graph structure being formed by a plurality of vertices corresponding to events as objects of analysis and an edge connecting the corresponding vertices to each other according to relation between the corresponding events, the plurality of computers corresponding to the respective vertices and being connected to each other so as to be able to send and receive data in correspondence with the edge; a storage device configured to retain identifier data having an attribute indicating one or more states for the events of the vertices, the identifier data being accumulated in each of the computers; and a display device configured to display a number of pieces of the identifier data retained in the storage device in relation to each of the vertices as a space distribution diagram based on distribution of the vertices; each of the computers calculating transition probability of identifier data between the computer and the computer corresponding to the adjacent vertex connected by the edge, by a predetermined algorithm based on the numbers of pieces of the identifier data retained by the mutual computers, and updating the numbers of pieces of the identifier data retained by the mutual computers according to a result of the calculation. 2. The information processing system according to claim 1, wherein each of the computers determines, as the attribute of the corresponding vertex, the attribute of a largest number of pieces of identifier data in the identifier data retained by the computer itself in relation to the vertex. 3. The information processing system according to claim 1, wherein each of the computers retains, as the algorithm, a mathematical equation for calculating the transition probability of the identifier data from the own computer to the other adjacent computer by a predetermined function having, as variables, the number of pieces of the identifier data related to each of the vertices retained by the computer itself and the number of pieces of the identifier data related to each of the vertices retained by the adjacent computer, and calculates the transition probability using the mathematical equation. 4. The information processing system according to claim 1, wherein each of the computers retains, as the algorithm, a table defining the transition probability of the identifier data from the own computer to the other adjacent computer, the table being determined in advance according to relation between the number of pieces of the identifier data related to each of the vertices retained by the computer itself and the number of pieces of the identifier data related to each of the vertices retained by the adjacent computer, and calculates the transition probability using the table. 5. The information processing system according to claim 1, wherein when updating the numbers of pieces of the identifier data according to the result of the calculation of the transition probability, each of the computers performs the updating so as to maintain a sum total of the numbers of pieces of the identifier data retained by the computer itself and the adjacent computer. 6. The information processing system according to claim 1, wherein one computer corresponds to a plurality of vertices in the graph structure. 7. An information processing system comprising: a managing computer; computers installed on respective racks within a warehouse; and portable terminals carried by respective workers collecting baggage arranged in the racks, the portable terminals being able to access the computers; each of the computers retaining information on numbers of pieces of identifier data of a plurality of kinds corresponding to predetermined events related to the racks or the baggage arranged in the corresponding racks, and receiving identifier data retained by each of the portable terminals when accessed by the portable terminal, transmitting identifier data determined on a basis of conditions of past changes in the identifier data already retained by the computer to the portable terminal, and updating the numbers of pieces of the identifier data of the plurality of kinds, the identifier data of the plurality of kinds being retained by the computer, on a basis of a subtracted number as a result of the transmission and reception of the identifier data to and from the portable terminal, each of the portable terminals receiving the identifier data from the computer, and updating identifier data retained by the portable terminal itself on a basis of the received identifier data, and each of the computers outputting, to the managing computer, an instruction to move the rack on which the computer itself is installed to an arrangement destination associated with a kind corresponding to a largest number of the numbers of pieces of the identifier data of the plurality of kinds, the identifier data of the plurality of kinds being retained by the computer itself, after passage of a predetermined time from the updating of the numbers of pieces of the identifier data. 8. An information processing system comprising: a managing computer; and computers associated with respective pieces of data within a data center; each of the computers retaining information on numbers of pieces of identifier data of a plurality of kinds corresponding to predetermined events related to the data, and when accessed by programs using each of the pieces of data, receiving identifier data retained by the programs, giving the programs identifier data determined on a basis of conditions of past changes in the identifier data already retained by the computer, and updating the numbers of pieces of the identifier data of the plurality of kinds, the identifier data of the plurality of kinds being retained by the computer, on a basis of a subtracted number as a result of the transmission and reception of the identifier data to and from the programs, each of the programs receiving the identifier data from the computer, and updating identifier data retained by the program itself on a basis of the received identifier data, and each of the computers outputting, to the managing computer, an instruction to move the data with which the computer itself is associated to an arrangement destination associated with a kind corresponding to a largest number of the numbers of pieces of the identifier data of the plurality of kinds, the identifier data of the plurality of kinds being retained by the computer itself, after passage of a predetermined time from the updating of the numbers of pieces of the identifier data. 9. An information processing system comprising: a plurality of terminals configured to transmit and receive a message via a network; and a managing computer; each of the terminals retaining information on numbers of pieces of identifier data of a plurality of kinds, when transmitting the message, transmitting, to another terminal among the plurality of terminals, the message to which identifier data determined on a basis of conditions of past changes in the numbers of pieces of identifier data already retained by the terminal itself is added, and updating the numbers of pieces of the identifier data of the plurality of kinds, the identifier data of the plurality of kinds being retained by the terminal itself, by subtracting a number of pieces of the transmitted identifier data, when receiving the message, updating the numbers of pieces of the identifier data of the plurality of kinds, the identifier data of the plurality of kinds being retained by the terminal itself, by adding a number of pieces of identifier data added to the received message, and transmitting, to the managing computer, the numbers of pieces of the identifier data of the plurality of kinds, the identifier data of the plurality of kinds being retained by the terminal itself, after passage of a predetermined time from the updating of the numbers of pieces of the identifier data, and the managing computer receiving the numbers of pieces of the identifier data of the plurality of kinds from each of the terminals, and displaying information indicating that terminals each having a largest number of pieces of identifier data belonging to a common kind are in a same group on a display terminal of the managing computer. 10. The information processing system according to claim 9, wherein when terminals come into physical proximity to each other, the terminals perform direct communication with each other in place of the transmission and reception of the message via the network, and update the numbers of pieces of the identifier data retained by the terminals. 11. An information processing method comprising: by a plurality of computers having a graph structure as a model, the graph structure being formed by a plurality of vertices corresponding to events as objects of analysis and an edge connecting the corresponding vertices to each other according to relation between the corresponding events, the plurality of computers corresponding to the respective vertices, being connected to each other so as to be able to send and receive data in correspondence with the edge, and retaining identifier data having an attribute indicating one or more states for the events of the vertices, calculating transition probability of identifier data between each of the computers and the computer corresponding to the adjacent vertex connected by the edge, by a predetermined algorithm based on numbers of pieces of the identifier data retained by the mutual computers, and updating the numbers of pieces of the identifier data retained by the mutual computers according to a result of the calculation; and displaying, on a display device, the number of pieces of the identifier data retained in relation to each of the vertices as a space distribution diagram based on distribution of the vertices. 12. The information processing method according to claim 11, wherein each of the computers determines, as the attribute of the corresponding vertex, the attribute of a largest number of pieces of identifier data in the identifier data retained by the computer itself in relation to the vertex. 13. The information processing method according to claim 11, wherein each of the computers retains, as the algorithm, a mathematical equation for calculating the transition probability of the identifier data from the own computer to the other adjacent computer by a predetermined function having, as variables, the number of pieces of the identifier data related to each of the vertices retained by the computer itself and the number of pieces of the identifier data related to each of the vertices retained by the adjacent computer, and calculates the transition probability using the mathematical equation. 14. The information processing method according to claim 11, wherein each of the computers retains, as the algorithm, a table defining the transition probability of the identifier data from the own computer to the other adjacent computer, the table being determined in advance according to relation between the number of pieces of the identifier data related to each of the vertices retained by the computer itself and the number of pieces of the identifier data related to each of the vertices retained by the adjacent computer, and calculates the transition probability using the table.