1. An image editing device, for editing a combined photographic image formed by combining a plurality of images, comprising: a first image processor for carrying out first image processing on an image and creating a first image; a second image processor for carrying out second image processing on the first image to create a second image; a combined photograph processor for creating a combined photograph by combining the second image in accordance with a combining position of the combined photograph; a storage medium for storing the first image and an image of the combined photograph; and a controller for, after the first image processing has been carried out, creating a combined photograph by combining the second image that has been subjected to the second image processing in accordance with a combining position of the combined photograph determined by the combined photograph processor, and storing the combined photograph and the first image as a single image file; wherein the controller, after the combined photograph has been created and the combined photograph and the first image are stored as a single image file, and a new combined image is created by replacing images, which are some of the images constituting the combined photograph, with replacement images that are different from the first image, subjects the replacement images to image processing by the first image processor, then subjects the replacement images to image processing by the second image processor, to create a new combined photograph in the combined photograph processor using replacement images that are subjected to image processing by the first image processor and the second image processor, and second images that are obtained by subjecting the first images other than the replacement images stored in the image file to image processing by the second image processor.