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.