VEHICLE TRAVEL ASSISTANCE DEVICE, VEHICLE TRAVEL ASSISTANCE SYSTEM, AND VEHICLE TRAVEL ASSISTANCE METHOD

The present invention provides a travel assistance device () for a vehicle, a travel assistance system (S) for a vehicle, and a travel assistance method for a vehicle with which the waste of energy of a vehicle (V) can be suppressed. In the present invention, when an unexpected user (UI) who has alighted at a stop location other than his/her alighting location included in reservation information is identified, a confirmation notification is output to the unexpected user (UI) as to whether or not to board the vehicle (V) again. When a determination is made, based on an input from the unexpected user (UI) in response to the output confirmation notification, that the unexpected user will not board the vehicle (V) again, the vehicle (V) is started from the stop location.