1. An image processing apparatus comprising: a region-of-interest decision unit that identifies an interest space region in which an object to be analyzed is likely to be present based on a distance image, which is shape information of an object space corresponding to a captured image to be analyzed acquired by a distance image sensor, to identify a region of interest in the captured image corresponding to the interest space region; and an image analysis unit that performs different image analyses for the region of interest and other image regions.