The signal sorting unit 250 sorts a processing signal that is transmitted from a functional unit (a first component) into a functional unit (a second component), referring to destination information that is included in the processing signal. The destination information is information with which the functional unit to which the processing signal is to be transmitted can be identified. Note that if the functional unit to which the processing signal is to be transmitted is included in the device (i.e., the nearby device 20a-1) that includes the signal sorting unit, the signal sorting unit 250 transmits the processing signal directly to the functional unit.

The remote device 20a-2 is a device (e.g., a server) that is collectively installed at a place (remote place) that is apart from the PON interface 10a for the sake of efficiency. The remote device 20a-2 includes an OLT function management unit 200.

The remote device 20a-3 is a device (e.g., a server) that is collectively installed at a place (remote place) that is apart from the PON interface 10a for the sake of efficiency. The remote device 20a-3 includes a device independent app unit B 201b.

When transmitting processing signals to another functional unit, the software unit 101, the OLT function management unit 200, the device independent app unit A 201a, and the device independent app unit B 201b add destination information to the processing signals and transmit the processing signals to the signal sorting unit 250.