According to an aspect of the present disclosure, there is provided a method of controlling a robot system including a plurality of moving robots each assigned a cleaning area, the method including receiving a command designating an urgent cleaning area, at least one moving robot of the plurality of moving robots moving to the urgent cleaning area according to a predetermined criterion based on the command, performing a cleaning operation by the moving robot having moved to the urgent cleaning area and a moving robot assigned the urgent cleaning area as a cleaning area, and returning to an assigned cleaning area by the moving robot having moved to the urgent cleaning area when the cleaning operation is completed.