An eye-tracking electronic device is provided. The eye-tracking electronic device includes a scanner, at least two photodetectors configured to generate electric pulses when a scanning line reflected from a cornea is incident thereon, and at least one processor configured to generate at least one scanning line through the scanner, radiate the at least one scanning line to the cornea, and determine a direction of gaze based on time information when the at least two photodetectors generate the electrical pulses.