A volume setting icon is provided with a slider for indicating a volume increasing from left toward right. A region in a direction of lower volume relative to a position corresponding to a current value, at which the slider is displayed, is identified as a volume low region, and a region in a direction of higher volume is identified as a volume high region. When the slider is selected, the slider can continuously be operated to move in any direction toward the volume low region and the volume high region. When the volume low region other than the slider is touched, the slider is instantaneously operated to move to a position corresponding to a touch position. When the volume high region other than the slider is touched, the slider is not instantaneously operated to move to a position corresponding to a touch position.