1. A facial expression recognition method, comprising the steps of: generating a gray image according to an original image; outputting a face edge detection result according to the gray image; generating a motion skin extraction result according to the original image and generating a face and background division result according to the motion skin extraction result; outputting a face contour according to the gray image, the face edge detection result and the face and background division result; and outputting a facial expression recognition result according to the face contour.