Mass transit terrorism is prevented to construct a safe society. To realize this, a film of a nitrogenous compound 6 is formed directly on a channel 5 of a transistor 1 comprising a source electrode 2, a drain electrode 3, a gate electrode 4 and the n-type channel 5 having a nanotube-shaped structure and provided between the source electrode 2 and the drain electrode 3. Accordingly, it is possible to provide a stabilized booster circuit in which an optimal gate voltage level of the charge transfer transistor can be set, overcharging can be suppressed, and the recovery time of the booster circuit can be shortened. The print server is notified of the user ID inputted from the printer so as to search for attached data corresponding to the notified user ID and transfer it to the printer for print. As viewed from the front side, a radius curvature of a first portion that intermediates a right side plane of the printer unit and a front plane of the printer unit is larger than a radius curvature of a second portion that intermediates a left side plane of the printer unit and the front plane of the printer unit. Further included is a transfer means to transfer to the processing unit, from the command transmitter, a processing program relating to the operation of the actuator andor of the sensor, the program being provided and stored in directly executable form.