Patent ID: 8726356

Claim:
A client apparatus, including a client function in a network, in which a plurality of Web browsing applications for performing single sign-on to a first server apparatus that provides a single sign-on function are installed, comprising: an application information management unit that stores registration information of a second Web browsing application of the plurality of Web browsing applications, the registration information indicating that the second Web browsing application can be linked with a first Web browsing application of the plurality of Web browsing applications; a server information management unit that stores a linkage ID which indicates a current connection between the client apparatus and the first server apparatus, the client apparatus being configured to transmit the linkage ID to a second server apparatus to permit the second server apparatus to perform account linkage with the first server apparatus; an application decision unit configured to share the linkage ID, stored in the server information management unit, with the second Web browsing application, after the first Web browsing application has performed a login authentication procedure with the first server apparatus, and the application decision unit determines that the second Web browsing application can be linked with a first Web browsing application based on the stored registration information, the client apparatus being configured to send the linkage ID to the second server apparatus to allow the second Web browsing application to receive service from the second server apparatus without the second Web browsing application performing a login authentication procedure with the second server apparatus.