8. A voice recognition device controller according to claim 1 , mounted on a movable body and further comprising a driving load detection unit configured to detect the driving load on the user who is the driver of the movable body, wherein the reference input item count setting unit sets the reference value for the number of items identified from the speech based on the content of the input speech and the driving load detected by the driving load detection unit.
8. A voice recognition device controller according to claim 1 , mounted on a movable body and further comprising a driving load detection unit configured to detect the driving load on the user who is the driver of the movable body, wherein the reference input item count setting unit sets the reference value for the number of items identified from the speech based on the content of the input speech and the driving load detected by the driving load detection unit. 9. A voice recognition device controller according to claim 8 , wherein the response control unit includes a unit configured to control a response in such a way as to prompt the user for a given number of items, with the given number set according to the learning level determined by the learning level determination unit and the driving load detected by the driving load detection unit, among items not identified from the speech recognized by the voice recognition unit, if any, among the given number of items necessary to control the device.