A method for generating a three-dimensional stereographic image on the basis of a two-dimensional planar image for one eye and depth information of the image stored in the Z-buffer. The first two-dimensional image for one eye of a viewer is created by rendering a three-dimensional model. Color information and depth information of the first two-dimensional image are stored in the frame buffer and the Z-buffer, respectively. The second two-dimensional image for the other eye of the viewer is created on the basis of the first two-dimensional image, the color information stored in the frame bufer, and the depth information stored in the Z-buffer. A stereographic image is generated on the basis of the first two-dimensional image and the second two-dimensional image.