An image forming apparatus acquires front and back images to be formed on paper and divides the front and back images of paper into a first image formed a part of the front image, a second image formed of the remaining part of the front image and a part of the back image, and a third image formed of the remaining part of the back image. The image forming apparatus forms the first and second images on the paper folded at the first position, and forms the third image on the paper folded at the second position. The image forming apparatus forms the first to third images such that the part of the front image and the remaining part of the front image constitute the front image and the part of the back image and the remaining part of the back image constitute the back image when the paper is unfolded.