1. An apparatus for displaying an autostereoscopic image comprising: a light source unit which includes a plurality of point light sources; and a display panel which displays an image by modulating light from the light source unit and has a plurality of pixel groups, each of the pixel groups including a plurality of whole pixels and at least one fraction pixel, and wherein each of the plurality of point light sources corresponds to a respective pixel group of the plurality of pixel groups, and wherein each of the plurality of whole pixels and at least one fraction pixel of each of the pixel groups is configured to modulate light from at least one of the plurality of light sources according to image information of a viewpoint different from each other.