COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, SYNCHRONIZATION METHOD, AND COMMUNICATION APPARATUS CONTROL PROGRAM

A communication system includes: a communication apparatus which is a clock master including an upper clock indicating a first apparatus time; a time detection section which detects the first apparatus time and a first reference time at substantially the same time; and a sending section by which the detected first apparatus time and first reference time to a non-clock master; a communication apparatus which is a non-clock master including an upper clock indicating a second apparatus time; a time detection section which at substantially the same time detects a second reference time synchronized with the first reference time and the detected second apparatus time; a receiving section receiving the first apparatus time and the first reference time; and an adjustment section by which the upper clock is adjusted with reference to the second apparatus time, the second reference time, the first apparatus time, and the first reference time. With this, communication apparatuses communicating with one another in a communication system can synchronize their apparatus times without performing simultaneous time detection in the respective communication apparatuses.