To restrict electric power supplied from an electric power feeder according to the status of an electronic device to prevent excessive electric power from being supplied to the electronic device.

The electronic device has: electric power receiving means for receiving electric power from an external device by radio; and resonance means for setting at least one of a resonance frequency of the electric power receiving means and a characteristic value of the electronic device which indicates resonance characteristics of the electronic device. On the basis of electric power required for performing a predetermined operation, before performing the predetermined operation, the resonance means is controlled so as to set at least one of the resonance frequency of the electric power receiving means and the characteristic value of the electronic device, and the predetermined operation is performed using electric power received on the basis of the resonance frequency and the characteristic value of the electronic device which are set by the resonance means.