Information on current positions of a construction machine and a service car is transmitted from terminals of the construction machine and the service car, and the information is accumulated in a construction machine position information accumulation device and a service car position information accumulation device. A service car search device searches for a service car within a predetermined radius with the current position of a construction machine requiring maintenance as the center. Because the service car search device can detect a service car near the subject construction machine, the need of searching for the service car on a map is eliminated and the service car can be easily found. Thus, construction machines and service cars can be appropriately managed.