A communication system includes an apparatus transmitting management information about management of consumable supplies and a mobile communication device that receives the management information. The communication device includes a detection part configured to detect a position of the communication device; a memory part configured to store a supplier's name of the consumable supplies and a position of the supplier; a setting part configured to set an area specified by a circle with a radius of predetermined length, which is centered on the position of the supplier stored in the memory part, as a control area; a display part; and a display control part configured to allow the display part to display the management information, the name of the supplier, and/or the position of the supplier when the display control part receives the management information from the apparatus and the position detected by the detection part falls within the control area.