Abstract: The distance between two points specified on an object is measured. The imaging part acquires a pair of images having parallax in one imaging operation on one and the same object. The display part displays a display image based on at least one image of the pair of images acquired. The reception part receives a start point and an end point specified on the object in the display image. The distance acquisition part calculates the positions in a real space of the start and end points specified on the object based on one pair or multiple pairs of images and acquires the distance between the start and end points on the object based on the calculated start and end point positions in the real space.