Provided is a top-view image generating method. The top-view image generating method estimates a posture angle of a camera providing at least one image, based on a ground feature point detected from the at least one image of front, rear, left, and right images and estimates a posture angle of a camera providing the other image from which the ground feature point is not detected. Subsequently, based on the estimated posture angles, the front, rear, left, and right images are rotation-converted, and then, a top-view image is generated by synthesizing images obtained through the rotation-conversion.