A driver assistance apparatus in a vehicle, the driving assistance apparatus including a sensor unit configured to sense a surrounding of the vehicle; an alarm unit on the vehicle configured to output an alarm outside of the vehicle; a transceiver configured to provide wireless communication; and a processor configured to detect a person included in the sensed surrounding of the vehicle is in an alarm situation, control the transceiver to transmit an alarm signal to a mobile terminal of the person to inform the person he or she is in the alarm situation in response to a successful attempt to communicate with the mobile terminal of the person, and output an alarm via the alarm unit towards the person to inform the person he or she is in the alarm situation in response to an unsuccessful attempt to communicate with the mobile terminal of the person.