A navigation apparatus acquires weather information along a navigation route to a destination from an information center and calculates an importance that is assigned to the weather information based on a predetermined criterion as well as a determination mode and a travel purpose inputted from a user. The importance of the weather information may be calculated by employing an importance calculation table that defines importance of the weather information itself or the importance of the weather information relative to the navigation route. The importance of the weather information is used to extract a required part of the weather information for providing the user with the information. The weather information extraction may be performed according to a criterion such as extracting the weather information with a certain importance level or higher, extracting the weather information of top n th importance, or the like.