To provide a system capable of efficiently exchanging data of a large size in a network connection using a portable information terminal.

This system is provided with a data terminal 200A to store the predetermined data, and an operational terminal 100A to control the access right to the data stored in the data terminal 200A. This operational terminal 100A imparts the access right to desired data to other operational terminal 100B. The data terminal 200A returns the data according to the access request based on the access right. On the other hand, the operational terminal 100B delivers the acquired access right to the data terminal 200B, the data terminal 200B gives access to the data terminal 200A via a network of a high-speed and stable wire circuit based on the access right, and acquires the desired data.