| 摘要 |
PROBLEM TO BE SOLVED: To control unauthorized use of an ID(identification) and a password. SOLUTION: A terminal device 1 provides the ID and the password to a service-providing server 11 of a service provider 10 via a network 2, the server 11 inquires the provided ID and password to an authentication server 21 of an authentication service provider 20, the server 21 collates the ID and the password to the ID and the password registered into an authentication database 22 to provide an inquiry result to the server 11, the sever 11 provides a service to the device 1 based on the result. The server 21, which has authenticated a user, updates the ID registered into the database 22 to provide the updated ID to the device 1, so that the device 1 stores the updated ID to use next time. |
