COMPUTER SYSTEM AND USER MANAGEMENT METHOD

PROBLEM TO BE SOLVED: To control use of a system by an individual user according to use authority decided to each the individual user without impairing maintainability and security. SOLUTION: When transmitting a user ID or the like to an operation management server 16 through a PC 12 to request login in use of an MI system 10 including a plurality of application systems realized by individual servers 14, the operation management server 16 issues a ticket after checking the user ID, and displays a menu screen capable of being used by only the application system whose use authority the user has, on a display 54. Various functions provided by the individual application system are used by transmitting the tickets to the corresponding server 14, and the server 14 authenticates the user by the ticket, and provides the requested function only when the user has the use authority of the requested function.