1. An obstacle detecting method of detecting an obstacle in surroundings of a vehicle, comprising: capturing an image of the surroundings of the vehicle; and scanning the captured image from one side of the captured image that is close to the vehicle toward an other side of the captured image that is remote from the vehicle, for detecting an obstacle through pattern matching, wherein the scanning scans the captured image from a right-hand side of the vehicle when the vehicle runs on a road in a right-hand traffic region.