Information linkage system and information linkage method

An inter-organizational information linkage platform method for linking information between a plurality of organization systems including a first organization system and one or more second organization systems, wherein each organization system of the plurality of organization systems comprises an organization database server, an application server and an information linkage system, wherein each information linkage system comprises a processor and an information linkage storage device coupled to the processor, wherein, for each user of a plurality of users, the organization database server stores identification information of the user and information regarding the user, wherein, in each organization system, the application server executes arbitrary processing by using linked data stored by the information linkage storage device and by executing an arbitrary service application program, wherein a first information linkage system of the first organization system has a first processor and is configured to link information between the first information linkage system and a second information linkage system of a second organization system, said information being information linkage target data, and wherein the first information linkage system is further configured to store identification information of a first user that is derived from the first organization system and information regarding the first user that is derived from the first organization system, the information linkage platform method comprising:

• adding, by the first processor, the identification information of the first user derived from the first organization system and the information regarding the first user derived from the first organization system by referring to a first data table in the first organization database server of the first information linkage system, wherein the identification information of the first user and the information regarding the first user are stored in association with each other in the first data table;
• transmitting, by the first processor, to the second information linkage system, an information linkage application for information regarding any one item included in the information regarding the user;
• acquiring, by the first processor, when the information linkage application is received by the second information linkage system, identification information of the first user that is derived from the second information linkage system, and information regarding the first user that is derived from the second information linkage system, of the item specified by the information linkage application, wherein a second processor of the second information linkage system organization is configured to add the identification information of the first user derived from second information linkage system and the information regarding the first user derived from second information linkage system by referring to a second data table in the second organization database server of the second organization system;
• registering, by the first processor, the information regarding the first user derived from the second organization, which is acquired from the second information linkage system, in the information linkage storage device in association with the identification information of the first user and the information regarding the first user, which are added by the first information linkage system;
• outputting, by the first processor, an input request for information to be used to generate authentication information of the first user;
• generating, by the first processor, authentication information of the first user by using information input in accordance with the input request;
• storing, by the first processor, the generated authentication information in the information linkage storage device in association with the identification information of the first user;
• outputting, by the first processor, an input request to the first user for authentication information;
• comparing, by the first processor, the authentication information input in accordance with the input request for the authentication information and the authentication information stored in the information linkage storage device in association with to the first user,
• updating and referring, by the first processor, to the information added by the plurality of the information linkage systems in accordance with access authority information;
• and
• transmitting, by the first processor, an update application for information regarding an item, for which the first organization system has no update authority, to one or more organizations in the plurality of organizations having update authority for the information regarding the data item;
• wherein a first application server included in the first organization system is configured to execute, when authentication is successful as a result of the comparison of the authentication information, processing that uses the information regarding the first user derived from the first organization system, which is stored in the first information linkage storage device, and the information regarding the first user derived from the second organization, which is acquired from the second organization,
• wherein the information linkage storage device is configured to store the access authority information indicating a presence or absence of a reference authority for the information added by the plurality of the information linkage systems, and a presence or absence of update authority for the information added by the plurality of the information linkage systems.