1. A three-dimensional image processing apparatus which processes a captured image of a scene using distance information indicating a first distance of the scene from a camera, the three-dimensional image processing apparatus comprising: a distance designation unit configured to receive input of a user-selected designated distance that is a target distance in which a stereoscopic effect is to be emphasized; a distance conversion unit configured to convert the first distance indicated in the distance information into a second distance that is represented in a distance image and used for generating three-dimensional images, and to emphasize the stereoscopic effect of the scene at the designated distance by selecting a change amount of the second distance with respect to the first distance that is largest at the designated distance; an emphasized image generation unit configured to generate a texture image based on the captured image, and to generate an emphasized image by processing the texture image to cause more blur to be included in a region where the change amount is largest, the emphasized image being an image in which the stereoscopic effect perceived by a viewer is emphasized according to the designated distance; and a disparity image generation unit configured to calculate a shift amount of each pixel of the texture image based on the distance image, and generate a pixel-shifted image by shifting each pixel of the texture image by the calculated shift amount, to generate, as the three-dimensional images, paired stereoscopic images including the texture image and the pixel-shifted image.