PURPOSE: To improve the safety and maneuverability of vehicle running by comparing information obtained from voice of a driver with travelling speed information of the vehicle to provide a constitution for warning according to the comparative result.

CONSTITUTION: When a driver announces to a microphone 1 "40 Km", for example, the voice is introduced as electric signal into a voice recognizing unit 2 which recognizes and converts the word of 40Km to a logic cord signal and send it to a microcomputer 4. Then, the microcomputer 4 counts pulses from a travelling speed signal generating unit 3 to obtain travelling speed information and compares it with speed information from the driver to judge which is larger or smaller and send speed-over signal or speed-under signal to a warning sound generating unit 5. Thus, said unit 5 converts these signals to audible signals for warning the driver and contributing to safe drive.