A method and apparatus for dynamically adjusting the user interface of a search engine in order to effectively communicate the improved relevancy achieved through real-time implicit re-ranking of search results is described. The present method comprises steps to. When the impact load is applied in a longitudinal direction of the vehicle, the lower connection device releases the connection between the headlamp and the bumper reinforcement. Therefore, optimum brake control can be conducted, a secure and sufficient brake amount can be provided, and the responsiveness in speed control can be enhanced.