1. A multiview image synthesizing apparatus using a depth map of a stereo camera comprising: a multiview image synthesizing unit for converting an image signal input from first and second cameras to a digital signal and outputting a value of a depth map at a position of a virtual camera located in a position between the first and second cameras; a multiview image re-projection unit for calculating a mapping pixel index of a multiview re-projection image for the virtual camera set by a user, by receiving the digital signal transmitted from the multiview image synthesizing unit, and outputting the calculated mapping pixel index; and a pixel selection unit for selecting a predetermined pixel to display an overlapping pixel of the digital signal input through the multiview image synthesizing unit, by using a signal output from the multiview image re-projection unit.