1. An image processing apparatus, comprising: a memory to store image data representing a 3D image, the image data including: first image data representing a left-eye image; second image data representing a right-eye image; and positional information regarding superimposed-areas included in the left-eye image and the right-eye image, the superimposed-areas being areas of the left-eye image and the right-eye image having information superimposed on the left-eye image and the right-eye image; and a processor, which accesses the image data; determines an amount of disparity in the left-eye image and the right-eye image, excluding the superimposed-areas; and shifts the whole left-eye image and the whole right-eye image according to the amount of disparity, excluding the superimposed-areas.