1. A method of improving visibility using gaze tracking, the method comprising: detecting a gaze of a user using a camera; determining a focus object at which the user gazes from among at least one object; transmitting, to a server, an image including the focus object and information associated with the focus object, wherein the information associated with the focus object includes at least one of location information of the electronic device and direction information of the electronic device; receiving, from the server, an image retrieved from storage by the server that corresponds to the focus object and has higher visibility than the transmitted image; and displaying, on a display unit, the retrieved image.