| 摘要 |
PROBLEM TO BE SOLVED: To provide a service on a computer network transparently to a mobile terminal via a mobile communication network (e.g. a PDC network adopting a line exchange system) without losing the portability of the mobile terminal. SOLUTION: The system is provided with a server in a LAN adopting the TCP/IP, a mobile terminal PS that is contained in a mobile communication network (e.g. a PDC network) of a line exchange system adopting a mobile communication protocol (e.g. a communication protocol provided with a WORM- ARQ function) where a load imposed on layers below a network layer is reduced more than a load imposed on the TCP/IP processing, an external port 2 for connection of the mobile terminal PS via the mobile communication network MN, and an internal port 1 to be connected to the LAN, and a communication protocol conversion means 4 that provides a new IP address to the external port 2 to mutually convert the communication protocol of data sent/received between the external port 2 and the internal port 1.
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