Abstract: Provided are an image processing apparatus and method which can adjust the disparity of an input three-dimensional (3D) image and stably display the 3D image. The image processing apparatus includes: an image dividing unit receiving a 3D image and dividing the 3D image into a left-eye image and a right-eye image; a histogram generation unit estimating disparities between the left-eye image and the right-eye image, measuring a frequency with which the estimated disparities occur, and generating a histogram of the disparities and the frequency; a horizontal movement value determination unit determining a horizontal movement value for the left-eye image and the right-eye image using the generated histogram; and a horizontal movement unit moving the left-eye image and the right-eye image horizontally based on the determined horizontal movement value. The image processing apparatus can control convergence of an image to enhance 3D effects and reduce eye fatigue.