There is a need for a network interface supporting various line speeds to have a smaller size and provide more flexible accommodation than the related art. In the present invention, provided is a communication device including a transfer processing unit which has four connectors capable of coupling with network interface units to be accommodated in one slot, and a packet processing circuit configured to process a packet input from the network interface via any one of the connectors and output the packet toward the network interface unit to be coupled with the connector, and a path control unit configured to manage a path between the packet processing circuit and the connector.