Valid session duration of traditional web applications is usually set short to decrease risks such as session hijacking and to avoid waste of the computational resources. When a client exceeds the valid duration of the idle time, the session of the client expires. After the expiration, the client must send requests and data all over again from the beginning in order to resume the session. Such resubmission irritates the users of web applications and decreases their ease of use. On the mobile networks, we encounter such situation frequently. In this paper, we propose a new session management method that resolves this problem by managing the session information and the data of web applications separately. We investigated the performance of the proposed method applied to a web application for business use. We will show the result that the proposed method realizes better usability while satisfying performance for the business web applications.