1. A non-transitory computer-readable storage medium having stored thereon an image generation program to be executed by a computer of a capturing apparatus, the image generation program causing the computer to perform: acquiring a captured image in real time with at least one capturing section; detecting a first face area from a plurality of face areas included in the acquired captured image, and acquiring an image in at least a part of the first face area as a first face image; and generating a face combination image by replacing at least a part of a second face area with the first face image, the second face area being included in the plurality of face areas and different from the first face area.