An in-vivo information acquiring system previously sets synchronization signals for each imaging unit which captures an image. In the in-vivo information acquiring system, a capsule endoscope transmits scan-line data of an image to be transmitted using the synchronization signal corresponding to the imaging unit which captures the image to be transmitted, and a receiving apparatus identifies that the received scan-line data forms the image captured by the imaging unit corresponding to the detected synchronization signal by detecting the synchronization signal from received information.
