Provided is a technology of monitoring the surroundings of a vehicle, wherein a driver approaching a vehicle is recognized, obstacles existing in the surroundings of the vehicle is searched, obstacle information related to the searched and found obstacles is generated, and the driver outside the vehicle is notified about the obstacle information. The driver approaching the vehicle can be recognized through communication with a mobile communication instrument carried by the driver. Furthermore, the technology of monitoring the surroundings of a vehicle decides whether the searched and found obstacle exists within a blind-spot area of the driver, and notifies the driver outside the vehicle about the obstacle information related to the obstacle, when there is an obstacle within the blind-spot area of the driver.