Abstract: The present invention relates to a session management system in which communications extending over a plurality of servers can be managed as an identical session. In this system, a URL received from an authenticated user bears a session management identifier. A display-data-creation-program control device having accepted the URL notifies it to a session-management-identifier management device. Upon verifying that the session management identifier is incorporated in the accepted URL, the identifier management device checks if a current session has been authenticated, by referring to the contents of a session-management-identifier management table. When the session has been authenticated as the result of the check, the session-management-identifier management device offers a service.