The watt-hour meter 10 measures the amount of power used by the customer 1, communicates with the parent device 20 through the first communication network NT1, and communicates with the device 30 provided in the customer 1 through the second communication network NT2. Configured to do. The watt-hour meter 10 includes a communication interface unit 11 and a control unit 12. The communication interface unit 11 transmits / receives a radio signal, and a channel determined by the frequency of the radio signal can be selected from a plurality of types. Shared. The control unit 12 controls the communication interface unit 11 so as to provide a period for performing communication in the first communication network NT1 and a period for performing communication in the second communication network NT2.
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