1. A steering risk decision system, comprising: an obstacle sensor configured to sense an obstacle to generate first sensor data; a driving state sensor configured to sense a driving state of a vehicle to generate second sensor data; and a processor configured to: extract feature points from the first sensor data to indicate the obstacle in point and line shapes; predict a driving region of the vehicle using the second sensor data; calculate a relationship between the vehicle and the obstacle using information for the obstacle indicated in the point and line shapes and information for the driving region; determine a steering risk of the vehicle based on the calculated results; wherein the processor is configured to set a region between two circular arcs formed by a trace generated by an inner wheel of a rotational direction of the vehicle and a trace generated by an outer wheel front corner of the rotational direction to the risk region; wherein the processor is configured to: classify front and side regions of the vehicle into a risk region, a warning region, and a safety region using information for the driving region; and compare the classified regions and information for the obstacle to determine a steering risk; and wherein the processor is configured to: divide the risk region and the warning region into a left region and a right region based on the center of a rear wheel shaft of the vehicle; and compare the divided regions and information for the obstacle to determine the steering risk for each of the left and right regions of the vehicle.