A power-fed terminal includes a first reception unit receiving, from another terminal, first information containing at least one frequency candidate that fails to be used by any other communication system, the frequency candidate being used for transmitting a first microwave, a second reception unit receiving the first microwave transmitted by the another terminal using the frequency candidate, a conversion unit converts an energy of the first microwave into a first DC energy, a transmission unit transmitting, to the another terminal, second information containing an optimum frequency corresponding to a maximum energy of the first DC energy, wherein the second reception unit receives a second microwave transmitted based on the second information by the another terminal, the conversion unit converts an energy of the second microwave into a second DC energy, the terminal further includes a secondary cell acquiring the second DC energy at the optimum frequency.