The invention is featured by a configuration, for notifying the end of printing to the client in asynchronous manner for the print job that cannot be reserved in the server, of judging the writing capacity of the reservation job file of the server prior to the notification of the end of printing to the client apparatus, and, only in case the reservation is possible, the reservation job manager notifies the end of printing to the client apparatus but, in case the reservation is not possible, the print job that cannot be reserved is managed in a reservation waiting state.