A packet multiplexing unit (44) deletes, from each of a plurality of packets in which a source address and a destination address are described, the source address and the destination address, adds, to each of the plurality of packets, a multiplexing identifier (ID) corresponding to a pair of the source address and the destination address thereof, and connects the plurality of packets to each of which the multiplexing ID is added. A packet transmission unit (45) transmits the plurality of packets connected by the packet multiplexing unit.
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