A video display control device is capable of driving plural types of video display units by one type of decoder. A video display control device (a control unit) includes a decoder for separating a composite video signal having a video signal and a synchronizing signal which are input into a horizontal synchronizing signal, a vertical synchronizing signal and a color signal, and generating a dot clock signal from the horizontal synchronizing signal and the vertical synchronizing signal, and a timing signal converting unit having storage areas capable of writing a signal converting program for converting the dot clock signal. The video display control device is connected to different display units.