PROBLEM TO BE SOLVED: To make it possible to perform maintenance of a facility such as a golf course even by an operator with less knowledge and experience or by an unmanned work vehicle.SOLUTION: A processing required for maintenance of a facility such as a golf course is executed by a computer system Cs. A sensor which detects data regarding growth of plants is mounted on a vehicle V that is movable at least on one region where plants grow. The computer system Cs, while the vehicle is moving at least on one region where plants grow, is configured to acquire data related to growth of plants detected by the sensor at least at one point of at least one region where plants grow, to generate information usable in maintenance of a facility based on the acquired data related to growth of plants, and to output the information.
