COMMUNICATION-CHANNEL CONTROL DEVICE, ADDRESS CONVERSION DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION-CHANNEL SETTING METHOD

A setting storage unit and an address conversion device selection unit, the setting storage unit stores combinations of first and second communication channels. A plurality of said first communication channels are set up between the following: a plurality of first node devices that connect a first network, in which a base station device is provided, to a second network and a plurality of address conversion devices in the second network. A plurality of the second communication channels are set up between the following: a plurality of second node devices that connect a third network to the second network and the plurality of address conversion devices. The address conversion device selection unit selects one of the address-conversion devices, each of which acts as a relay between one of the first and second node devices via one of the first communication channels and one of the second communication channels.