An object of the present invention is to allow for correctly confirming whether image data is stored or not, and to allow for downsizing of an apparatus scale. An intra-subject information acquiring system according to the present invention includes a receiving apparatus 3 that acquires image data from a capsule endoscope 2, and a monitor apparatus 7 that displays image data acquired by the receiving apparatus 3. The receiving apparatus 3 includes an image determining unit 40 that determines validity/invalidity of the acquired image data, a data generator 41 that generates data for output in which the result of determination is added to an image signal, and a differential transmission I/F 44 that transmits the data for output to the monitor apparatus 7. The monitor apparatus 7 includes a determination result detector 75 that detects the determination result included in an image signal, which is the data for output from the receiving apparatus 3, and a display unit 76 that displays image data based on the image signal and information corresponding to the determination result.
