A method and system utilizes a hierarchical bitmap structure to represent deleted data sets. The inventive method includes the steps of specifying pagination information including an indication of whether a page is to be selectively included in the book, determining whether the page is to be assembled into the book based on the pagination information, and generating page description language instructions for production of the book in accordance with the pagination information. A cellular phone selects a location area ID of a location area which is obtained by using a section pattern corresponding to the mobile station usage category of the cellular phone, among the plurality of location area IDs contained in the control signal received from the base station, and performs location registration processing by use of the selected location area ID. Two cutoff devices are coupled between the gate driver and the gate drive signal generator, and supply or cut off the gate drive signal to the gate driver based on a command from an external apparatus. In yet another embodiment, a computer-readable medium contains instructions for controlling a computer system to perform a method of using a plurality of classifier engines to classify a document.