1. An apparatus for creating a stereo image, the apparatus comprising: a frequency measuring unit which selects one of a left view image and a right view image as a selected image and measures high frequency components of the selected image to determine if the selected image has more high frequency components in a horizontal direction or a vertical direction; a first synthesizing unit which synthesizes the left view image and the right view image into a stereo image having a side-by-side format; a second synthesizing unit which synthesizes the left view image and the right view image into a stereo image having a top-bottom format; and a selecting unit which selects one of the stereo image having the side-by-side format output from the first synthesizing unit and the stereo image output having the top-bottom format from the second synthesizing unit according to the output of the frequency measuring unit, and outputs a selected stereo image.