1. A method of processing a 3 dimensional image containing an additional object in a system providing a multiview image, comprising the steps of: receiving video images and depth images for a plurality of views; configuring an additional object among additional objects displayed on the video images for a plurality of the views as a reference additional object; calculating a disparity of a pixel of a video image adjacent to an area on which the reference additional object and an edge of the reference additional object; synthesizing the reference additional object with a video image of a first view and a video image of a second view in a manner of applying a disparity value equal to or greater than the calculated disparity value to the reference additional object; and formatting the video image of the first view and the video image of the second view with which the reference additional object is synthesized as a 3 dimensional image.