An information processing apparatus classifies a piece of content data as a first or second category in response to a user operation while outputting the content data for a predetermined time. Such elements may include a rotary motion detector which includes a rotating member and a plurality of fixed capacitive detecting members; a rolling ball with patterned conductive surface and a plurality of fixed capacitive detecting members; capacitive touch sensors or capacitive switches to serve as mouse buttons; and a scrolling wheel, knob, or touch surface built from capacitive sensors. The visor may include a primary coil, an image receiving element that receives a picture image, a light emitting element that transmits an electric stimulus signal produced based on an image signal from the image receiving element, and an eye-gaze point recognizing unit. The TRIC instruction determines whether the run-time-instrumentation controls have changed. The third printed layer is printed with a third ink, and covers or fills a boundary between the first printed layer and the second printed layer, and has a color difference with respect to the first printed layer and the second printed layer.