Abstract: A smart door lock system and a control method thereof are proposed. More specifically, in the smart door lock system and the control method thereof, door-lock area information is displayed on an outer side of a door, the door-lock area information including: any one or more pieces of door-lock area state information on states of a door lock area entered through a door lock in which a smart door lock is installed; and door-lock area user information of users who use the door lock area.