An in-vivo image acquiring system includes a capsule endoscope which is introduced into the inside of a subject to acquire an in-vivo image of the subject and a receiving apparatus for receiving the in-vivo images of the subject from the capsule endoscope through receiving antennas. The capsule endoscope transmits the in-vivo images of the subject taken successively at a time interval corresponding to function or feature of the capsule endoscope. The receiving apparatus calculates a time interval of the in-vivo images received successively from the capsule endoscope and identifies the in-vivo images depending on the function or feature of the capsule endoscope based on a calculated time interval.
