A method for using a portable terminal includes activating a timer function with respect to a certain button if a touch on the button is detected for at least a predetermined time, measuring a touch hold time with respect to the button from a time point at which the touch is input when the timer function is activated, setting a countdown time corresponding to the touch hold time with respect to the button, performing a countdown for the set countdown time when the touch on the button ends, and performing a function corresponding to the button when the countdown is completed.