A server stores facility information about a plurality of facilities to be searched for, in association with categories representing the facilities, and performs a search to determine whether or not each category contains any facility located within a predetermined area including the search point. A navigation system displays, based on search results from the server, the categories serving as search conditions in a manner such that whether or not there is any facility within each category is identifiable. For example, an image representing a category may be set not to be displayed when there is no facility within the category. Thus, based on the display status of each category, the user can identify whether or not there is any facility within each category at the time when categories to be searched are displayed.