A template image is found and a target image is combined with a combining area of the found template image. The template image found has first template image analysis information, which is of a type identical with that of first target image analysis information in target image analysis information consisting of the brightness, contrast, saturation, hue, color balance and spatial frequency of the target image, and for which the degree of resemblance is equal to or greater than a first threshold value, and moreover has second template image analysis information, which is of a type identical with that of second target image analysis information in target image analysis information, and for which the degree of resemblance is less than a second threshold value.