An information provision system, which includes (i) a navigation apparatus in a vehicle and (ii) an information center, provides an occupant of the vehicle with information. The navigation apparatus and information center communicate via a wireless communication link. The navigation apparatus wirelessly acquires reception position information, which indicates several reception positions, from the information center. When determining that the vehicle reaches one of the reception positions, the navigation apparatus wirelessly acquires, in association with the reached reception position, display-related information containing (i) display position information indicating a display position and (ii) at-display-position window information indicating contents of a display window displayed at the display position. When determining that the vehicle reaches the display position, the navigation apparatus displays the contents of the corresponding display window indicated by the acquired at-display-position window information.