An object of the present invention is to provide an in-vivo information acquiring system capable of acquiring transmission data corresponding to an image even when the in-vivo information acquiring system does not properly receive all transmitted data due to a transmission error which occurs during the transmission of image data. In the in-vivo information acquiring system, a capsule endoscope 2 transmits scan-line data of an image to be transmitted, using a synchronization signal corresponding to an imaging unit which has captured the image to be transmitted. A receiving apparatus detects the synchronization signal from received information and identifies that an image formed by received scan-line data, using the imaging unit corresponding to the detected synchronization signal.
