PROBLEM TO BE SOLVED: To simplify, while suppressing power consumption during the off standby of a reader writer-side information communication device in a communication system, a user operation needed for starting short-range wireless communication between a tag side and a reader writer side.SOLUTION: A reader write-side body composition meter 3 (the CPU thereof) exerts control, upon detecting by a proximity sensor that a tag-side activity meter 2 has approached within a prescribed distance, so that the NFC communication control IC of own device starts a process for causing the NFC communication control IC on the activity meter 2 side to go to an NFC communicatable state (S22). Thus, unlike in a conventional technique, there is no need to make the body composition meter 3 detect the proximity of the activity meter 2 after a user 61 turns the body composition meter 3 on by a key operation during the off standby of the body composition meter 3, making it possible to simplify a user operation needed at start of NFC communication. Furthermore, since the body composition meter 3 does not need to perform the process S22 during off standby, it is possible to suppress power consumption during the off standby of the body composition meter 3.SELECTED DRAWING: Figure 6
