1. An image processing apparatus for aiding that a user acquires an optimal low-resolution image set for a super-resolution processing in generating a high-resolution image by using a plurality of low-resolution images and by means of said super-resolution processing, comprising: an image input unit for inputting said plurality of low-resolution images; a basis image selecting unit for selecting a basis image from said plurality of low-resolution images that are inputted; a reference image selecting unit for selecting a plurality of reference images to be used in said super-resolution processing from said plurality of low-resolution images that are inputted; a displacement amount computing unit for computing a displacement amount for performing registration on a high-resolution image space between said basis image and said each reference image; a deformed image generating unit for generating a plurality of deformed images based on said displacement amounts and said plurality of reference images; a high-resolution grid image generating unit for generating high-resolution grid images based on said displacement amounts, said basis image and information about said reference images and said deformed images; an image characteristic amount computing unit for computing image characteristic amounts due to filling state of image based on said high-resolution grid image; and an image characteristic amount display unit for displaying said image characteristic amounts.