1. A method of controlling a stereo convergence, the method comprising: detecting objects from a stereo image comprising a left eye image and a right eye image; grouping the detected objects into at least one object group according to setup specification information; and moving at least one of the left eye image and the right eye image of the stereo image of the object group or a setup area comprising the object group in a horizontal or vertical direction, or in both the horizontal and vertical directions.