1. An image forming apparatus comprising: an image acquisition unit which acquires a print target image; a scanner which scans an image on a sheet; a recognition unit which recognizes reuse information from the image scanned by the scanner; a generation unit which generates reuse information after printing the print target image from the reuse information recognized by the recognition unit and the print target image acquired by the image acquisition unit; a selection unit which selects an area where the reuse information generated by the generation unit can be printed, in the print target image acquired by the image acquisition unit; a combination unit which combines the reuse information generated by the generation unit with the area selected by the selection unit in the print target image; a deletion unit which deletes the image on the sheet from which the image is scanned by the scanner; and an image forming unit which forms the combined image created by the combination unit on the sheet from which the image is deleted by the deletion unit, with a erasable image forming material.