a video signal processing apparatus which can process video signals with different formats simply by switching between programs for processing video signals . different system clock signals are sent to the input and output processes by employing a programmable signal processor 4 , input synchronizing signal processor 8 , programmable signal processor 6 and output synchronizing pulse processor 9 . a method for processing the video signal can be flexibly changed simply by switching between signal processing programs for programmable signal processors . in addition , the use of a memory 5 enables the signal , which is processed using the system clock signal in the input process , to be processed using the system clock signal in the output process . the present invention thus allows the processing of video signals with many different signal formats . the design of efficient circuitry will greatly reduce costs and production processes .