display 301 is divided into a pc mode and an av mode if the pc mode is examined first the signal generator 302 provides image signals to the display 301 via the pc interface for displaying an image the color temperature sensor 304 senses the color temperature generated by the image the color analyzer 305 analyzes the color temperature to obtain a color temperature value and sends the color temperature value to the computer system 303 for color temperature comparison the computer system 303 compares the sensed color temperature value with the predetermined one resulting in different color temperature calibrating sequences according to the comparison result i e whether both values are consistent or not if consistent it proceeds to examine another color temperature the computer system 303 transmits a control signal to the second wireless transceiver 313 of the signal generator 302 via the fourth wireless transceiver 315 so as to display another image and continue completing color temperature examination and calibration until all color temperature examination and calibration of the pc interface under the pc mode are completed then color temperature examination and calibration of the av mode is carried out under the av mode the signal generator 302 provides image signals to the display 301 via the av interface and the computer system 303 transmits control signals to the second wireless transceiver 313 of the signal generator 302 via the fourth wireless transceiver 315 for carrying out the color temperature examination and calibration until all color temperature examination.