| 摘要 |
A private, protect or public authorization level is set in a service server that provides a service. The set authorization level and type, etc., indicating the content of the service are transmitted to a center server, which proceeds to generate a management table indicating the content, etc., of the service. If a request for a service list is received from a client computer, then the client computer is sent the service list, which contains the service type, etc., other than that for which the authorization level is private. The client computer requests the service server for a service. If the requested service is of the protect authorization level, authentication is carried out. The authenticated user of the client computer is capable of receiving the service.
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