Patent ID: 8632457

Claim:
A receiving apparatus comprising: a plurality of receiving antennas that receive a radio signal from a mobile unit movable in a subject, data on the interior of the subject being acquired based on the radio signal received through any one of the plurality of receiving antennas, the plurality of receiving antennas including a specified receiving antenna that is specified in advance from the plurality of receiving antennas as an antenna for receiving the radio signal from the mobile unit until the mobile unit reaches a predetermined portion in the subject; a switching controller that performs an antenna switching control operation in two modes which are an initial mode and a normal mode, wherein the switching controller, in the initial mode, switches the receiving antenna that receives the radio signal to the specified receiving antenna and maintains a state in which only the specified antenna receives the radio signal, and the switching controller, in the normal mode selects any one of the plurality of receiving antennas in accordance with a predetermined condition every time the radio signal is received and switches the receiving antenna that receives the radio signal to the selected one of the plurality of receiving antennas; a determining unit that determines whether the mobile unit has reached the predetermined portion in the subject or not; and a mode switching unit that instructs the switching controller to perform the antenna switching control operation in the initial mode until the determining unit determines that the mobile unit has reached the predetermined portion in the subject, the mode switching unit instructing the switching controller to perform the antenna switching control operation by switching the initial mode to the normal mode, when the determining unit determines that the mobile unit has reached the predetermined portion in the subject.