To provide a trouble shooting method of a vehicle to a user by a user-friendly method.

This navigation device 1 for displaying a map on a display and guiding the user has, in a storage device 18, a trouble response DB (database) 20 including data for displaying the trouble shooting method of the vehicle. When the user issues an instruction via a user operation analysis section 108, and when a failure is detected via a failure detection section 110, a main control section 100 acquires data corresponding to the trouble of the vehicle from the trouble response DB 20 and displays the trouble shooting method on the display 11.