An object is to provide a receiver system that allows a plurality of antennas to be easily attached onto a body surface without losing receiving functions of the antennas while improving freedom for a living body. A receiver system transmits in-vivo information including in-vivo images received from a capsule endoscope being the interior of a subject to an exterior receiving device via a plurality of wireless relay devices. Each of the wireless relay devices includes a receiving unit that receives the in-vivo information from the capsule endoscope at a first frequency, a transmitting unit that transmits the in-vivo information at a second frequency, a receiving unit that receives a control signal transmitted by the receiving device at the second frequency, and a control unit that controls transmissions and receptions performed by the receiving unit and the transmitting unit based on the control signal.
