An extracting unit detects movement from a first area to a second area, the first area and the second area defined as areas having different priorities. When the extracting unit detects the movement, this changes a communication process defined in the first area to the communication process defined in the second area. A notifying unit notifies that the area changed when the movement is detected. Herein, the priority of the first area and the priority of the second area are defined according to importance of a signal, which should be broadcasted from a processing unit.