Abstract: Prediction information based on past statuses (management information) and past management information and the present management information are comparatively displayed in real time at a call center, thereby enabling arrival call statuses of the whole call center to be easily grasped. A management device connected to an exchange accommodating a plurality of terminal devices used for receiving calls, receives status information showing the call receiving status of each terminal device from the exchange, totalizes pieces of status information of the whole terminal devices and obtaining, as management information, at least one of a total count, an average and a rate with respect to a predetermined status of call, and gets the management information displayed on a display device.