To provide an image forming apparatus enabled in quality improvement in the computerization of a paper document while reducing a human burden, and a program.

The image forming apparatus 2 scans the document comprised of at least one page a plurality of times and acquires a plurality of document images scanned from the document. Then, determination is made on whether or not the same condition is satisfied for images for that page in the two document images to be approximately the same at each page in each respective document image pair extracted from these document images. Next, the result of the determination is displayed and outputted, for example.