Patent ID: 7873059

Claim:
A gateway device comprising: a first communication unit connected to a first network which operates according to Internet Protocol (IP) used for the Internet to communicate with a device connected to the first network; a second communication unit connected to a second network to communicate with a device connected to the second network; an identifier management unit for outputting an IP identifier in the first network to correspond to the device connected to the second network; a correlation unit for starting an emulation process corresponding to the device connected to the second network, the emulation process correlating the IP identifier to the device connected to the second network; an identifier notification unit for notifying the IP identifier to the device connected to the first network; a command information notification unit for notifying command information which can be executed in the first network to the device connected to the first network; a command conversion unit for converting a command of the first network, which is received from the device connected to the first network, into a command of the second network; and a stream transfer unit for converting stream data transmitted from the second network based on a transfer protocol of the second network into a transfer protocol of the first network to transfer the stream data to the first network, wherein the gateway device supplies the converted command to the emulation process corresponding to the device connected to the second network on the basis of the IP identifier, in order to operate_the device connected to the second network to transfer the stream data stored in the device to the device connected to the first network in accordance with the command.