1. A method for enhancing an image edge, the method comprising receiving RGB data; converting the RGB data into YCbCr data; extracting an edge value by performing an edge filtering process with respect to a Y channel of the YCbCr data; determining vagueness of the extracted edge value for an edge and noise; applying an N×N (N is an integer number) mask to a pixel corresponding to the edge value and calculating a maximum value, a minimum value, and a mean value based on the N×N mask if the extracted edge value has the vagueness for the noise and the edge; determining if the pixel corresponding to the edge value is the edge or the noise by using the maximum value, the minimum value, and the mean value; and performing an edge enhancement process with respect to the pixel corresponding to the edge value if the pixel is determined as the edge.