An electronic device with an alarm clock function includes a storage unit storing at least one icon; a display unit including a plurality of display areas; an input unit including a plurality of input parts each of which corresponds to one of the display areas; a managing unit for enabling or disabling an alarm clock function; an area selection module for randomly selecting one of the display areas and outputting the icon on the selected display area; and a comparison module for determining whether the input part pressed by a user matches the selected display area. A method for controlling the alarm clock function is also provided.