Providing an information system in an item delivery system comprises reading a tracking indicia on a unit load, updating a database with first data from the tracking indicia, and updating the database with information that the unit load has been terminated. Lighting, shading, geometric, andor other attributes of the scene may be precalculated and stored for at least one of the scene representations at an appropriate level of detail. A plurality of sensors can be provided for sensing usage of a plurality of parts of the aircraft, and the estimate of usage of the part can be stored for access of the estimate by ground personnel. The loaded carton can be carried by the handle after a dispenser has been opened. Fluctuations in the light quantity of the light beams of the plurality of colors having passed through the display units and yet to be input to the color synthesis unit are detected. When power-off is instructed in the suspended state, the data processing apparatus shifts from the suspended state to the power-off state without the mediacy of the standby state.