An image processing apparatus, an image processing method, and an image processing program are provided. The processing apparatus, method, and program relate to image processing executed in an AF camera, etc., and make clear a variation in an image displayed during focusing operation. The image processing apparatus includes an image-capturing element that puts out an image formed through an optical system, a focus controlling unit that controls the optical system to locate it at a focusing position, using the image obtained by the image-capturing element through the optical system, and an image processing unit that forms a pseudo-image during focusing operation of the optical system caused by the focus controlling unit, the pseudo-image showing a resolution variation enlarged to be greater than that of the image obtained by the image-capturing element.