Provided are an apparatus and method by which a touch sensor controller of a touch screen apparatus may efficiently process a touch signal in response to a touch event to reduce power consumption of the entire system. An apparatus including a touch screen includes a touch sensor controller configured to generate a touch signal in response to a touch event and process the touch signal and a system controller configured to receive the touch signal from the touch sensor controller and perform an operation in response to the touch signal. The touch sensor controller determines whether the touch event is a multi-touch, generates touch signals having different types depending on whether the touch event is the multi-touch, and transmits the touch signals to the system controller. Thus, power consumption of the apparatus including the touch screen may be efficiently reduced.