1. A method for tracking a color-based object in video sequences formed with frames, the method comprising: (a) assigning an initial object area in one frame of the video sequences desired to be tracked, assigning an initial object effective window containing the initial object area, and calculating a model color histogram of the initial object area using a predetermined bin resolution; (b) receiving a frame following the frame containing the initial object area assigned in step (a) as a newly input image, and assigning an object search window containing an object area in the newly input image to which the initial object area for tracking were transformed and moved, and the initial object effective window assigned in step (a); (c) calculating an input color histogram which is a color histogram of the image in the object search window, using the predetermined bin resolution used in step (a); (d) calculating an object probability image in the object search window, by using the model color histogram of the initial object area and the input color histogram of the image in the object search window; (e) updating the object effective window of the object area to which the initial object area were transformed and moved, using the object probability image and the initial object effective window so that the area of the object which is the target of tracking is included in the updated new object effective window; and (f) detecting a new object area in a newly input image, using a predetermined method, from the object probability image obtained in step (d) in the new object effective window finally updated in step (e).