A device includes an image capturing device having a speech recognition device and a receiving device. The speech recognition device includes a voice command unit stored a plurality of voice commands, a voice character memory unit stored a plurality of voice characteristics corresponding to the voice commands for indentifying the commands conforming to the voice characteristics received in the receiving device to form a voice command set, and an image characteristic memory unit stored a plurality of image characteristics corresponding to the voice commands of the voice command set. The image capturing device captures a real-time image to compare with the image characteristic in the image characteristic memory unit. The image capturing device selects a command from the command set and executes the selected command according to the comparing result generated by the image capturing device.