A mobile robot system and a related control method sets a virtual wall as a specific area so that a mobile robot cannot approach within a cleaning area to restrict a traveling of the mobile robot, registers the virtual wall on a map when the virtual wall for restrict the approach of the mobile robot is set by a terminal, calculates a location of the virtual wall for the cleaning area to avoid the virtual wall, and restricts the approach of the mobile robot by matching the virtual wall to the cleaning area, controlling the mobile robot as if an actual physical obstacle exists by setting the virtual wall on the map through the terminal and matching to an actual cleaning area, and achieving an easy cleaning setting and effectively controlling the mobile robot as it can be plurally set at a desired location irrespective of the number.