| 摘要 |
A method for realizing Single Sign-On (SSO) includes verifying, using prior information, whether authorization information issued by a first information processing system in response to successfully authenticating a user satisfies security requirements, providing, in a case where the authorization information is verified as satisfying the security requirements, a service without performing the user authentication, and performing, if an instruction to register a first information processing system that performs user authentication is received from the user, the registration by a method different from a method according to a management method of the prior information in the first information processing system.
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