1. An image combining apparatus comprising: a background image impression category determination device for determining the category of an impression given by a background image representing background of a location to be decorated with a picture frame in which a print has been inserted; a picture frame image detection device for finding a picture frame image that falls within the category of the impression determined by said background image impression category determination device; an image correction device for performing a correction that causes an image representing the print to approach a target value for each category of impression determined by said background image impression category determination device; and a combining device for combining the image, which has been corrected by said image correction device, with a combining area of the picture frame image found by said picture frame image detection device, thereby generating a composite image.