An exemplary object of the present invention is to accurately reflect allocation requests and increase the bandwidth use efficiency without requiring expensive and fast integrated circuits or CPUs in the control unit even in a large-scale system with a large number of terminal devices. A subscriber station comprises allocating means for determining bandwidth allocation based on a predetermined allocation condition and bandwidth transmitting means for transmitting bandwidth allocation information determined by the allocating means to an optical line terminator. The optical line terminator comprises pipeline transmitting means for transmitting bandwidth allocation information transmitted from the subscriber stations to all subscriber stations to be allocated with bandwidth.