A monitoring device for an image forming device receives from the image forming device usage information indicating a history of manipulations by a user and reduction information indicating that the image forming device is operating in a reduction mode. When having received reduction information, the monitoring device determines the priority of maintenance work on a function the provision of which has been halted indicated by the reduction information, registers the determined priority in a management table in association, and outputs the registered reduction information and associated priority. When the received usage information indicates a manipulation with respect to a function the provision of which has been halted indicated by the received reduction information, the priority corresponding to the reduction information is determined to be relatively higher than when there is no manipulation with respect to the function the provision of which has been halted indicated by the received reduction information.