In order to obtain an optimum depth enhancement effect for three-dimensional (3D) images, a depth information extractor configured to compute depth information from an input video signal, a 2D/3D converter configured to convert, when the input video signal is a two-dimensional (2D) video signal, the 2D video signal to a first video signal which is a 3D video signal based on the depth information, a correction factor calculator configured to compute a correction factor based on the depth information, a selector configured to select either the input video signal or the first video signal and output the selected signal, and a contour enhancement processor configured to perform an enhancement process on the output of the selector based on the correction factor and output the enhanced signal as an output video signal are provided.