1. A person tracking method comprising: detecting a person in a first window of a current input image using a skin color of the person; and setting a plurality of second windows in a next input image having a temporal delay from the current input image, correlating the first window and the second windows and tracking the detected person in the next input image using the correlated results, wherein the method is performed using a computer system, and wherein the second windows are set in the next input image centered around the locations of first samples selected in the next input image according to a particle filter.