1. A method of removing the staff lines from a music score included in a received image, the method comprising the steps of: detecting a region containing the staff lines within the music score image; checking a gradient of the staff lines, dividing the staff lines extending continuously in a longitudinal direction into a plurality of regions in consideration of the gradient; estimating each of the staff lines included in each of the divided regions of the music score by analyzing a histogram of the image within the region; determining each of the estimated staff lines from the music score; and removing each of the determined staff lines from the music score.