<P>PROBLEM TO BE SOLVED: To enable correct recognition of a positional relation between an image to be taken and an image to overlap the image. <P>SOLUTION: In a guide image display unit S1, a guide image r10 indicating an overlapping portion of a photographic image to be taken by a photographing unit and a precedent image S11 stored in advance is displayed. <P>COPYRIGHT: (C)2012,JPO&INPIT
