A voltage application is performed between an electrode and a material to be machined periodically. This may involve forming a silicon substrate and implanting oxygen into the substrate. The first pollutant-removing means includes a catalyst that oxidizes the pollutant by means of oxygen in the air, and the catalyst has an oxidizing activity with respect to at least one selected from the group consisting of organic substances, nitrogen oxides, sulfur oxides, ammonia, hydrogen sulfide, and carbon monoxide. A database server receives from a client a request to access the LOB. In the event of successful validation, the terminal then activates the inactive token, either directly or indirectly. Using the presentation application, the user can export the audio-visual media file to another source or program, such as the Internet or QuickTime.