1. A three-dimensional photography apparatus comprising: a camera configured to form two-dimensional viewpoint images on imagers, respectively, the two-dimensional viewpoint images corresponding respectively to right and left eyes of one or more users, each imager having a resolution higher than that of a display for displaying a three-dimensional image to be perceived by the one or more users based on the two-dimensional viewpoint images from the camera; and a processing unit configured to adjust a parallax between or among the two-dimensional viewpoint images formed on the imagers in accordance with a user's instruction, wherein the camera includes at least two lenses, and forms the two-dimensional viewpoint images through the at least two lenses, respectively, the imagers correspond respectively to the at least two lenses, the imagers form images, based on which the two-dimensional viewpoint images are respectively obtained, through the at least two lenses, each two-dimensional viewpoint image is obtained from an area within corresponding one of the images formed on the respective imagers, and the processing unit adjusts the parallax among the two-dimensional viewpoint images by shifting an area within corresponding one of the images.