An image that is changed according to a change of a numerical value is displayed. A first numerical value changing section changes the numerical value between a first predetermined value and a second predetermined value. A first input value is acquired based on the numerical value obtained at a time corresponding to a time of a first operation. A second numerical value changing section changes, after the first operation, the numerical value between the numerical value obtained at the time corresponding to the time of the first operation and the second predetermined value. A second input value is acquired based on the numerical value obtained at the time corresponding to the time of the first operation and the numerical value obtained at a time corresponding to a time of a second operation. A game is controlled based on the first input value and the second input value.