1. A method of matching positions of images, in which positions of two images of a single same object are matched with each other, the method comprising the steps of: i) performing approximate position matching processing with respect to entire areas of the two images, ii) selecting local area limited regions, between which a degree of shift is high, in the two images, whose positions have been approximately matched with each other by the approximate position matching processing, and iii) performing position re-matching processing with respect to at least the local area limited regions, which have thus been selected.