1. A vehicle side image recognition method, comprising: inputting images containing recognized vehicles captured by a camera apparatus; sorting images with the recognized vehicles located at left and right sides of the camera apparatus from the input images; performing vehicle side image recognition processing on the sorted images to acquire side image information of each of the recognized vehicles; and outputting the acquired side image information of each of the recognized vehicles; wherein the act of performing vehicle side image recognition processing further comprises: acquiring a side shadow underneath each of the recognized vehicles from the left and right sides in the sorted images, acquiring a vehicle side edge of each of the recognized vehicles along the direction of the side shadow underneath each of the recognized vehicles in the sorted images; determining side image coordinate information of each of the recognized vehicles based on coordinates of the acquired side shadow underneath a vehicle and the acquired vehicle side edge of the recognized vehicle.