In an optical line terminal connectable to optical network units in an optical communication network, an receiver converts an upstream optical signal, received from an optical network unit, into a corresponding upstream electric signal and then derives an upstream control signal controlling the optical line terminal from the upstream electric signal. A controller generates a power control signal switching on or off power supply to the receiver on the basis of the upstream control signal, and a power feeder switches on or off the power supply to the receiver in response to the power control signal. Thus, the optical line terminal can reduce the waste of standby electricity.