A detection unit detects the number of items identified from recognized speech of user among a given number of items necessary to control the device. A comparison unit compares the detected number of items with a reference value set for the number of items based on the content of input speech. A determination unit determines a learning level in the speech based on the comparison result. A control unit controls the response output to the user according to determined learning level. An independent claim is included for voice recognition device controlling method.
Voice recognition device controller mounted on vehicle, has determination unit to determine learning level in speech of user based on comparison between number of items identified from recognized speech and set reference value