Abstract: Provided are a method and a device for smart control of a vehicle while defending against an RSA by using a mobile device. The method includes the steps of: establishing a communication network to be able to transmit/receive information to/from a mobile device of a driver through Bluetooth or Wi-Fi; and determining, when an RSS value of a Bluetooth or Wi-Fi signal received from the mobile device of the driver is measured to be equal to or larger than a predetermined reference value, that the position of the mobile device of the driver is within a predetermined primary range (25 m) and transmitting a sound wave of 2 to 24000 Hz that can be recognized through three or more speakers mounted in the vehicle.