The disclosure provides an electronic device adapted to communicate with a stylus. The electronic device includes a display panel, a touch module, and a processor. The display panel has a display area, the touch module has a touchable area, and the processor is electrically connected to the display panel and the touch module. The processor is configured to: define at least one effective input area in response to an operation of the stylus in the touchable area, and when the touch module detects that the stylus is approaching the effective input area, switch the effective input area to a stylus mode, and display a range marking pattern in the effective input area.