To provide a technology for reading a card face and a technology for executing an instruction corresponding to the read card face, allowing both sides of an information output device (a stage casing) having a touch panel and the other dot pattern reader to use a card, for providing the card rich in convenience and flexibility such that two kinds of information can be provided by a single card.

In this read-instruction execution method for the card face, dot patterns are respectively formed on the front face and the rear face of the card. In the dot pattern, an application ID for specifying an application associated to each face, a card face number for specifying the card face, and XY coordinates are patterned. In the read-instruction execution method for the card face, the different applications respectively associated to the front and rear faces of the card can be executed.