A communication device is provided which includes a positioning information receiving portion that receives positioning information, by wireless signal, from another communication device, the positioning information including first satellite orbit information that indicates respective orbits of a specific number of satellites and position information that indicates a position of the other communication device, an initialization processing portion that performs initialization processing that specifies, based on the positioning information received by the positioning information receiving portion, from among the specific number of satellites, a plurality of satellites transmitting satellite signals that can be received by the communication device.