A vehicle management method and system is able to monitor and manage a fleet of vehicles with high efficiency and low cost. The management method includes the steps of providing a radio transmitter connected to a vehicle navigation system in each vehicle, providing a radio transmitter connected to a facility computer in a vehicle management facility, receiving information regarding use of a vehicle by the vehicle navigation system from the facility computer which is transmitted through the radio transmitters, monitoring usage of the vehicle and storing data thereof in a memory, and sending the stored data to the facility computer through the radio transmitters.