A liquid crystal display control device is provided with a clock generating circuit for generating, on the basis of a first synchronous signal, a 1/n-frequency dot clock whose period is equal to n-times the dot period of a first video signal (n≧2) and whose phase varies on dot-period basis for every frame period of the first video signal, an input circuit for picking up the first video signal in accordance with the 1/n-frequency dot clock and outputting digital display data, a frame memory in which the digital display data are stored, and a control circuit for generating a second synchronous signal for a liquid crystal display and reading out the display data stored in the frame memory to generate a second video signal, whereby a series of operations from a pickup operation of the video signal to a display operation of the liquid crystal panel can be performed at a lower speed while suppressing deterioration in quality of display images.