SYSTEM AND METHOD FOR PROCESSING AUTHENTICATION BY TEMPORARY DATABASE

An authentication processing system and an authenticating method thereof perform a subscription/termination process and an authentication process of a client without delay by using a temporary database. A customer information database server(200) stores and manages the customer information of the mobile communication subscribers. A gateway server(300) receives an additional service subscription/termination request and an authentication request from the mobile communication terminal. An authentication dedicated server(100) stores only the customer authentication information of the customer information database server in the authentication data base, and stores the corresponding authentication information in the temporary DB after processing the subscription/termination registration of the corresponding service when the gateway server receives the subscription/termination request, and processes a client authentication by using the customer authentication information stored in the authentication DB and the authentication information stored temporarily in the temporary DB according to the authentication request received in the gateway server.