1. An image forming apparatus for forming a combined image by combining a predetermined number of images, comprising: an image storing unit that stores a plurality of images; a template storing unit that stores a template for the combined image, said template including a predetermined number of image combination frames for which image editing conditions are defined; an image selecting unit that selects said predetermined number of images to be combined in the predetermined number of image combination frames of said template out of said plurality of images; an image editing unit that edits each of said selected images according to each of said image editing conditions for each of said predetermined number of image combination frames of said template; and an image combining unit that arranges each of said edited images in each of said predetermined number of image combination frames of said template and combines the arranged images to form said combined image.