1. An object processing device comprising: an identifying information generating portion for generating identifying information capable of identifying a plurality of objects respectively and generating identifying layout information constituted by giving the identifying information to dots related to the objects respectively over the same two-dimensional layout as the image in relation to an image including the objects; an identifying information acquiring portion for acquiring identifying information corresponding to any of the dots which is designated over an image displayed on a display device from the identifying layout information; and an object selecting portion for selecting any of the objects which corresponds to the identifying information acquired by the identifying information acquiring portion, wherein the identifying information generating portion decides whether the objects overlap with each other or not and gives the identifying information of the objects to the dots which correspond to the objects having no overlap respectively, and gives the identifying information of the objects to the dots which correspond to a portion having no overlap in relation to the objects having the overlap, and divides the overlapping portion into a plurality of small regions to give the identifying information of the objects to the dots corresponding to the small regions respectively, thereby generating the identifying layout information, wherein the identifying information generating portion classifies a plurality of objects included in the image into a plurality of groups, and generates first identifying layout information constituted by giving identifying information capable of identifying the groups to dots corresponding to a predetermined region surrounding all of the objects included in the groups respectively over the same two-dimensional layout as the image with respect to the respective groups, and second identifying layout information constituted by giving identifying information capable of identifying the individual objects to the dots corresponding to the individual objects included in the group respectively over the same two-dimensional layout as the image with respect to the respective objects included in the group, and the object selecting portion selects a group including an object corresponding to the identifying information acquired from the first identifying layout information through the identifying information acquiring portion and selects an object corresponding to the identifying information acquired from the second identifying layout information through the identifying information acquiring portion.