Abstract: An apparatus for automatically controlling a crossing gate being installed at an entrance/exit way of a vehicle and controlling entrance/exit of the vehicle, including: a password setting unit for setting a combined row of input numbers or characters as a password; a signal sensing unit for sensing a change in an amount of light of light signal patterns of the vehicle; and a controller including a first signal converter that analyzes the sensed change in the amount of light of light signal patterns of the vehicle and that converts the analyzed light signal patterns into a Morse code, a second signal converter that converts the converted Morse code into a combined row of numbers or characters, and a driving controller that controls opening/closing of the crossing gate depending on whether the converted combined row of numbers or characters is the same as the password set by the password setting unit.