8. A voice control method performed by a mobile device, comprising: performing speech command recognition to output a recognized speech command; processing sensor data generated from at least one auxiliary sensor to determine a motion of a mobile device comprising the voice control device, to generate a detection output; and referring to the recognized speech command and the detection output to decide a response of voice control; wherein when the detection output indicates a first motion of the mobile device, the voice control has a first response for the recognized speech command; and when the detection output indicates a second motion of the mobile device, the voice control has a second response for the same recognized speech command, where the second motion is different from the first motion, and the second response is different from the first response.
9. The voice control method of claim 8 , wherein the step of performing the speech command recognition comprises: determining the recognized speech command according to at least a predefined command set which is consistently used during the speech command recognition.