A system and method for managing electronic information using a computer system for one or more users. In the apparatus, the mirror array device is illuminated by R, G and B color light components from different directions, and at least a part of the reflected light of the mirror array device is selectively guided to the projecting optical system to project the light on to the screen or the like by controlling a tilt angle of the mirror array device. A liquid-state light curing active monomer and plasticizer are added to the mixture. An anticipated blood alcohol level is calculated based upon the current order and previous orders of alcoholic beverages. An appropriate conductive material may then be filled in the through holes to form via structures with increased uniformity in their transverse areas.