A beverage supplying device, wherein the device is provided with a controller for discharging the beverage selected from multiple types of beverages from a prescribed nozzle, and a storage unit for storing data that indicates the dilution ratio of each of the beverages, the remaining amount of each of the syrups, and the supply amount per container of the beverage. The controller calculates the discharge amount per container of syrup used to produce the selected beverage on the basis of the data indicating the dilution ratio of the selected beverage, and the data indicating the supply amount per container of the beverage. Next, the controller calculates the number of selected beverages available for sale on the basis of the data indicating the remaining amount of syrup used to produce the selected beverage and the calculated discharge amount, and displays available-for-sale numbers.