Navigation system

A navigation system characterized by including speech-recognition devices 2 and 3 for performing speech-recognition processing on input speech, language determining devices 4 and 5 for determining a language used by a speaker of this input speech based on the contents of the input speech recognized by the speech-recognition devices 2 and 3, and navigation processing devices 6, 7, 8, 10, 11, 12, and 13 for performing a navigation operation corresponding to the language determined by the language determining devices 4 and 5.