1. A method for integrating multiple camera images to track a vehicle, adapted to a server tracking the vehicle by using images captured by a plurality of cameras, the method comprising: receiving a request to track the vehicle, wherein the request comprises a registration information and a position information of the vehicle; retrieving a plurality of images captured by the plurality of cameras in a specific range around a location of the position information; analyzing the retrieved images according to the registration information, so as to recognize the images comprising the vehicle; and issuing a message when the images comprising the vehicle are recognized.