Disclosed is a method of transforming a stereoscopic image, including: extracting a depth map from a left-eye image and a right-eye image of the stereoscopic image as the left-eye image and the right-eye image are input; obtaining transformation information from the depth map; and transforming red, green, and blue (RGB) values of the stereoscopic image based on the transformation information. It is possible to provide a stereoscopic image having an improved three-dimensional effect, compared to an existing stereoscopic image.