1. An information processing apparatus comprising: processing circuitry configured to perform a process comprising (a) specifying, for each image object amongst a plurality of image objects represented in image data, an attribute of the image object, the specified attribute being one of: text, when the image object is expressed by a character string; or graphics, when the image object is expressed by vector data; or image, when the image object is expressed by binary data; (b) identifying all image objects having the specified attribute from among the plurality of image objects and (c) creating, for each identified image object of the identified image objects with the specified attribute, an additional object that has an identical shape to the identified image object and that is to be superimposed on the identified image object.