1. An information processing apparatus comprising: an attribute specifying unit configured to specify an attribute of an image object that is a subject on which an additional object indicating an additional image object is superimposed; a first identifying unit configured to identify all image objects having the attribute specified by the attribute specifying unit from among a plurality of image objects included in image data; and a creating unit configured to create, for each of the image objects identified by the first identifying unit, the additional object that has an identical shape to the image object and that is to be superimposed on the image object.