REMOTE ACCESS SYSTEM, DEVICE, METHOD AND PROGRAM

摘要

Provided are a terminal device and a remote access system to a home network having a home gateway. The terminal device is provided with a first Universal Plug and Play (UPnP) unit for communicating based on the UPnP protocol, and a first message conversion unit for converting a UPnP discovery message to unicast. The gateway is comprised of a second UPnP unit for communicating based on the UPnP protocol; a network address translator (NAT) unit which translates between the private address assigned to a device and a global address; a second message conversion unit which converts a unicast discovery message received from the terminal device to a multicast discovery message, and transmits the message to a private network; and a third message conversion unit which rewrites the private address of the device included in the reply message received from the device to the global address corresponding to the private address.