An image processing device processes a document including a document data body and at least one set of related data, and includes a display that displays an image of the document data body and an image of the related data overlaid on the image of the document data body at overlay positions determined for each set of related data and an image data generator that generates printing image data of the document data body of the overlay position when an instruction to print the document is received, regardless of whether or not the related data is displayed.