COMMUNICATION METHOD, COMMUNICATION DEVICE, PORTABLE TELEPHONE TERMINAL, AND COMMUNICATION SYSTEM

摘要

A home gateway device (22) is connected to a storage device (24). A portable telephone terminal (10) is connected to the home gateway device (22) through an IP network (20). When receiving a telephone number from the portable telephone terminal (10), the home gateway device (22) reports the IP address of the home gateway device (22) to the portable telephone terminal (10). Subsequently, when receiving a request for connection to the reported IP address from the portable telephone terminal (10), the home gateway device (22) executes authentication for the connection request on the basis of the telephone number of the portable telephone terminal (10) and the already received telephone number. Furthermore, the home gateway device (22) allows the authenticated portable telephone terminal (10) to use a storage device (24) through the IP network (20).