A method of representing a point of interest, a destination, or an address in a database for a navigation system for a vehicle by a plurality of points to militate against a driver not being notified upon arrival at the point of interest, the destination, or the address. The present disclosure also provides for a shorter tubing junction while reducing effective width, further reducing trauma to the body. The measured biological signals include an electromyography signal and an electroencephalogram signal. The control system 4 not only stores manufacturing information and historical information of all the fenders 1 that are objects to be managed, but also updates the historical information on the basis of the individual update information received from the terminal 2.