Communication apparatus and communication system

A communication apparatus comprising:

• a clock time management section that manages a clock time;
• a clock time measurement section that measures a clock time of another clock time management section of another apparatus and a clock time of the clock time management section for every predetermined processing, in a course of communication with the other apparatus having the other clock time management section;
• a clock time difference generation section that generates a clock time difference between the clock time of the other clock time management section and the clock time of the clock time management section on a basis of the measured clock times;
• and
• a clock time correction section that corrects the clock time of the clock time management section on a basis of the generated clock time difference.

A communication system comprising:

• first and second communication apparatuses each including a clock time management section that manages a clock time, wherein
• the first communication apparatus includes
• a clock time measurement section that measures a clock time of the clock time management section of the second communication apparatus and a clock time of the clock time management section of the first communication apparatus for every predetermined processing, in a course of communication with the second communication apparatus,
• a clock time difference generation section that generates a clock time difference between the clock time of the clock time management section of the second communication apparatus and the clock time of the clock time management section of the first communication apparatus on a basis of the measured clock times, and
• a clock time correction instruction section that instructs the other apparatus to correct the clock time of the clock time management section of the second communication apparatus on a basis of the generated clock time difference, and
• the second communication apparatus corrects the clock time of the clock time management section of the second communication apparatus according to the instruction from the clock time correction instruction section of the first communication apparatus.