A user interface for selecting a function for a device, such as a digital camera, to perform. In accordance with the most preferred form of the invention, the contents viewing system is constituted by a mirror member mounted underneath an upper refrigerator shelf for the purpose of viewing objects located on the lower shelf. The player can predict a predicted order, and the predicted order is compared to an actual stopping order after the reels are spun to determine if the side wager is a winner, and for how much. A CPU sets a threshold voltage to a value corresponding to the temperature of the pressurizing roller detected by a temperature sensor, and detects whether the recording sheet is wound around the pressurizing roller, based upon the set threshold voltage and voltage of the pressurizing roller in the sheet passing area detected by the winding sensor. It then prompts a message to the user that it has finished.