A wearable electronic device including a wireless communication unit configured to be wirelessly connected to a projector for projecting a stored presentation onto a screen of an external device; a main body configured to be worn by a user; a microphone integrally connected to the main body; a display unit configured to be attached to the main body; and a controller configured to match voice information input through the microphone with corresponding contents of the stored presentation, and display at least a following portion of content that follow the corresponding contents on the display unit.