Patent ID: 7496949

Claim:
A network system, comprising: a client; a proxy server that is connected to the client; and a server and an authentication server, wherein the client and the proxy server, and the server and the authentication server are connected to each other via a communication network, and the proxy server includes: a storing unit configured to store session information on an authentication process between the client terminal and the authentication server; a receiving unit configured to receive a request for access to the server from the client terminal; a transmitting unit configured to transmit the request for access to the server; and an identifying unit configured to: identify, when receiving from the server a request for authentication to the authentication server, the request for access corresponding to the request for authentication in accordance with the request for authentication; identify the client terminal which transmits the identified request for access in accordance with the identified request for access; and identify, from the stored session information, session information between the identified client terminal and the authentication server which is requested the request for authentication; wherein the transmitting unit is configured to transmit the identified session information to the authentication server.