Patent ID: 8635672

Claim:
A thin client-server system, in which a server having a database to store user data, and a thin client terminal acquiring the user data from the server are connected each other through a network, wherein the thin client terminal comprises: a communication processing unit that transmits and receives data; a storage unit that issues a user data acquisition request to the server through the communication processing unit, the storage unit that stores user data, which is acquired from the server, in a volatile memory; a thin client terminal side authentication unit that executes authentication to judge whether reference to the user data that is stored in the volatile memory is permitted or not; and a control unit that controls the thin client terminal side authentication unit to execute the authentication in a case in which the thin client terminal issues a request for referring to the data that is stored in the volatile memory, after completion of the reference to the user data that is stored in the volatile memory, and the control unit permits the reference to the user data that is stored in the volatile memory in a case in which the authentication results in success, and the control unit deletes the user data that is stored in the volatile memory in a case in which the authentication results in failure.