An input method of an electronic device using an input device including a drawing unit is provided. The input method includes acquiring drawing unit related information, confirming an attribute of the drawing unit based on the acquired drawing unit-related information, receiving a drawing input by an input device, to which the drawing unit is attached, using a touch panel of the electronic device, and outputting a drawing expression through the display of the electronic device in response to an attribute of the drawing unit and a drawing pattern of the drawing input.