Disclosed an image forming apparatus including: an image forming section to form an image on a sheet based on an input image data; an additional information position instruction section to instruct a position of an additional image indicating additional information to be formed with the image data; a sheet-cutting position instruction section to instruct a sheet-cutting position on the sheet; and a control section to calculate an image formable region where the additional image can be formed based on the sheet-cutting position instructed by the sheet-cutting position instruction section, to set the position instructed by the additional information position instruction section within the image formable region as a position where the additional image is formed, to combine the additional image with the image data at the set position, and to control the image forming section to form the combined image data on the sheet.