1. An image processing apparatus comprising: an image input unit that inputs binocular stereoscopic image data including plane image data for a left eye and a right eye from an arbitrarily set viewpoint; a plane-image creating unit that creates plane image data based on the binocular stereoscopic image data input; a distance determining unit that determines distances from a single viewpoint at the time of viewing a binocular stereoscopic image based on the binocular stereoscopic image data to each of a plurality of points in a three-dimensional space; an image correcting unit that corrects the plane image data using distance information about the each of the points in the three-dimensional space determined; and an image output unit that outputs the plane image data corrected.