<p>Disclosed is a curve speed warning method including the steps of: turning on the CSWS, which is a system for warning a driver, when a vehicle operates in a speed that exceeds a safe speed for a curved road; obtaining curve road information from external environmental information during the operation of the vehicle; obtaining a current operating speed of the vehicle; and giving a warning when the operating speed is determined as exceeding the safe speed using the curve road information obtained during the operation of the vehicle.</p>
