A semiconductor device includes a first input unit for receiving a first signal; a first processing unit configured to perform a frequency dispersion processing on the first signal; a first output unit configured to output the first signal or the first signal on which the first processing unit performs the frequency dispersion processing; a second input unit configured to receive a second signal generated through performing a predetermined image processing with an image processing unit on the first signal output from the first output unit; a second processing unit configured to perform the frequency dispersion processing on the second signal; an enable signal input unit configured to receive an enable signal; and a second output unit configured to output one of the first signal and the second signal as an output signal according to the enable signal.