An image processing device, which includes a reading section that reads image information on both sides; an inquiry section that inquires operational authority; and an execution section that executes a desired operation if the operational authority exists, wherein the document is synthesizedly printed, and the image processing device further includes: an extraction section that extracts added image information; a first determining section that, if the added image information is not extracted, determines whether the information is included in a next surface or in a preceding surface; a second determining section that, if included, determines whether a attribute is imparted to the information, and whether a logical page number agrees with a logical total number of pages; and an image processing section that, if the attribute is imparted and the numbers agree, ignores the image information of the printing surface, and subjects image information of another surface to image processing.