US Patent 7154620 Image forming device management system and method

In image forming device management system and method of the present invention, a data communication device transmits, on an early message date that is earlier than a normal message date for a corresponding one of a plurality of image forming devices, a usage data of the corresponding one of the image forming devices to a center management device via a telephone network by using a call sent by the data communication device. The center management device receives, on the early message date for the corresponding one of the image forming devices, the usage data of the corresponding one of the image forming devices that is transmitted by the data communication device, by using the call sent by the data communication device. The center management device issues a billing of a usage charge of the corresponding one of the image forming devices based on the usage data received by the center management device.