1. A method for controlling a three dimensional (3D) photographing apparatus, the method comprising: acquiring a feature point of a left-eye image entering through a left-eye lens, and a feature point of a right-eye image entering through a right-eye lens; detecting a disparity between the left- and right-eye images by comparing the feature points of the left- and right-eye images; controlling a distance between the left- and right-eye lenses so that the disparity between the left- and right-eye images becomes a previously-set reference disparity; and shifting at least one of the left- and right-eye images so that a convergence point is placed on a first object located within the left- and right-eye images, wherein the detecting comprises: determining a number of frames of a previous left-eye image or a previous right-eye image based on an intensity of illumination of the left- or right-eye image; and determining a consistency of disparity between the left- and right-eye images using the frames of the previous left- or right-eye images.