An object of the invention is to receive, with a high sensitivity, a radio signal transmitted within a short time before a capsule endoscope reaches the stomach of a subject and acquire, in a satisfactory state, information on the interior of the subject such as image data picked up by the capsule endoscope. The receiving apparatus according to the invention includes a plurality of receiving antennas (3a to 3h) including a specified receiving antenna (3a) for receiving a radio signal from a capsule endoscope (2) before the stomach is reached, a switching controller (33), an arrival determining unit (38a) and a mode switching unit (38b). The switching controller (33) performs a control operation for switching to and maintaining the receiving antenna (3a) in an initial mode or a control operation for switching to the receiving antennas (3b to 3h) in a normal mode. The arrival determining unit (38b) determines whether the capsule endoscope (2) has reached the stomach or not. The mode switching unit (38b) instructs the switching controller (33) to perform the control operation for switching to the initial mode, and upon determination that the stomach has been reached, gives the instruction to perform the control operation for switching to the normal mode.
