1. An image processing apparatus for use with a three-dimensional (3D) image divided into a left-eye image and a right-eye image in a display device comprising a processor, comprising: a disparity estimation unit estimating disparities between the left-eye image and the right-eye image; a movement determination unit determining a movement value for the left-eye image and the right-eye image using the estimated disparities; and a movement unit translating the left-eye image and the right-eye image based on the determined movement value, wherein the movement value is a value for a horizontal movement and the movement unit translates the left-eye image and the right-eye image horizontally based on the determined movement value, and wherein the movement determination unit averages the estimated disparities and determines the average disparity to be the movement value, and the movement unit moves the left-eye image and the right-eye image horizontally based on half the movement value multiplied by a predetermined proportionality constant.