Abstract: A method and system that can determine the shortest elapsed time route in multiple routes and provide such information to users. The method comprises the steps of: a) acquiring average driving time of each of the plural route segments; b) accumulating the average driving time of each of the plural route segments in each of the plural routes; and c) selecting a route having the lowest accumulated average driving time. The system comprises plural wireless stations, a computer device, and an optimum route planning system. The plural wireless stations are installed at each first end and second end of each of the plural route segments for receiving identification information transmitted from a wireless communication device in automobiles traveling in each of the plural route segments. The computer device is communicated with the wireless stations for recording information of the time that each of the automobiles arrives in each of the first end and second end of each of the plural route segments.