A method for managing a parking lot is provided. The method includes: capturing, by a first video camera, an image of a vehicle; determining whether the image satisfies a condition; raising a first barrier when the image satisfies the condition; detecting whether there is only the one vehicle between the first barrier and a second barrier; and raising the second barrier to enable the vehicle to enter or leave the parking lot when detecting that there is only the one vehicle between the first barrier and the second barrier.