Communication device, a communication system, path determination method, and a program

Communication device communicates with the other party apparatus through one of the working path or the protection path. Communication device is configured to select one of the paths from the two paths, and a plurality of selector including different sub selector and the main selector and the main selector, the selection of the last path of the plurality of selector the path selected by the selection unit subjected to, and a path determination section that determines a channel to be used for communication with the other party apparatus. Said main selector, the working path and, selecting one of the paths and one spare path, from among the plurality of standby routes. The sub selection unit, a path one sub selector different from the preceding stage of the main selecting section or the sub-selection unit selects, and one spare path among the plurality of standby routes, one path from select.