Abstract: An ad device having a changing board including a plurality of flaps, which can express at least two advertisements to the front and behind faces of the plurality of ad flaps. The plane figure of each ad flap is an isosceles triangle. A supporting step is provided to make the changing board flat when the ad flaps are overlapped with neighboring ad flaps in an edge portion. An additional board may be provided to show another advertisement when the flaps are vertical stands. Accordingly, it is possible to maintain more exactly the horizontal state and the vertical state of the ad device and it is possible to prevent dust or foreign substances from entering into the ad device by having no gap between ad flaps.

Abstract: In an inventive cup luminous apparatus and its control method, the cup luminous apparatus is capable of luminescing in various colors corresponding to the fluid level of beverage put in a cup thus providing the cup with a light effect, detecting a proper consistency, a decay extent and an appropriate temperature of the beverage put into the cup, and then luminescing in mutually different colors based on its detection result, whereby a user may visually recognize a physical state of the beverage. The inventive cup also automatically flickers in case that the cup is slanted and is provided so as to be mounted more easily.