Disclosed is a head mounted electronic device including a body, a lens clip having at least one opening defined therein, wherein the lens clip is disposed on the body so as to face toward a face of a user, an infrared-ray emissive device disposed on one portion of the body, an infrared-ray imaging device disposed on an opposite portion of the body to one portion thereof, wherein the infrared-ray imaging device acquires a first eyeball image obtained when infrared-ray emitting from the infrared-ray emissive device is reflected from an eyeball of the user, and a processor operatively connected to the infrared-ray emissive device and the infrared-ray imaging device.