Cross-application-system user information integration method and identity information management server

The embodiment of the invention discloses a cross-application-system user information integration method and an identity information management server. A cross-system user system comprises the identity information management server and application systems. The server stores inquiry indexes of all user accounts in all the application systems and operating authorization grades corresponding to all user information of all the user accounts. The user accounts with the same inquiry indexes in different application systems are associated with one another. The method comprises the steps that the server receives an operation request sent by the first application system, wherein the operation request carries the system number of the first application system, user numbers of the specified user accounts, specified user information and specified operations; the server validates whether the specified user accounts can conduct the specified operations on the specified user information in the first application system; after validation is passed, the server notifies associated application systems satisfying operating conditions to execute the specified operations on the specified user information, wherein the operating conditions include that the operating authorization grade of the specified user information is lower than or equal to a reference operating authorization grade.