| 摘要 |
PROBLEM TO BE SOLVED: To provide a user authentication system which integrates user authentication systems for different use services to enable a user to enjoy various services by one ID and password. SOLUTION: A common authentication server 1 prepares a user information database 14 that previously stores common authentication information for each user, and a use service authentication conversion database 15 that previously stores user authentication information for each user used for each use service. The server, if it receives the common authentication information and a service ID for identifying the use service from a terminal 21, ascertains whether or not the received common authentication information is registered with the user information database 14, if it is registered, extracts the user authentication information corresponding to the service ID received from the use service authentication conversion database 15 based on the received common authentication information, and makes a use service authentication server 3 authenticate the extracted user authentication information. |
