1. A navigation system for vehicles comprising: a location detector section for detecting a location of a vehicle; a mapping data memory section for memorizing mapping data including various kinds of facility information; an input section; an facility search section for determining a facility to be searched according to a character string inputted from said input section and for retrieving facility information of the facility to be searched from said mapping data memory section; and a display section for displaying a location of the vehicle and the facility information outputted from said facility search section; wherein said facility search section includes a fuzziness interpretation section for converting any fuzzy search word included in the inputted character string into a defined condition, and extracts and outputs the target facility using the facility information of said facility to be searched on the basis of the defined condition.