1. An image enhancement system to adjust an input image according to an emotional scale of the input image, the image enhancement system comprising: an emotional scale detection unit to analyze a pixel value of one or more frames of the input image in order to automatically detect the emotional scale of the input image; and an image enhancement unit to enhance a quality of the input image based on an image mode selected according to the emotional scale, wherein the selecting of the image mode includes selecting the image mode of the input image based on an image mode corresponding to a predetermined emotional scale, and wherein the enhancing of the quality of the input image comprises adjusting an image factor according to the selected image mode.