Electronic device and its input method

The invention provides an input method for an electronic device with a touch display screen. The input method comprises steps of firstly receiving an input signal, then displaying at least one control option on the touch display screen, wherein the control option has a corresponding control region on the touch display screen, and further detecting whether an input confirmation signal is inputted in the corresponding control region of the touch display screen or not, and if the input confirmation signal is detected, then adjusting one parameter of the control option.