1. An image processing apparatus that generates one still image having a high pixel density from multiple images, said image processing apparatus comprising: an image extraction module that extracts the multiple images used for generation of the one still image; a deviation computation module that computes a degree of deviation between each combination of the extracted multiple images; an image selection module that selects at least two images among the extracted multiple images, based on the computed degrees of deviation; and an image composition module that combines the at least two selected images to generate the one still image.