A video signal processing apparatus 1 and a video processing parameter setting apparatus 2 comprise a video processing apparatus (visual mixer). A parameter value collectively specifying portion 3 specifies in accordance with the order stored in an arpeggiator pattern memory 7, sets of scene data which collectively specify values of a plurality of parameters stored in a scene data memory 6. A changing process portion 4 changes in a given length of time, the values of video processing parameters from the values currently set on the video signal processing apparatus 1 to the parameter values collectively specified as a set of scene data. The changing process is started at a timing corresponding to a change time and completed at a subsequent switch timing. As a result, the video processing apparatus allows for collective specification of parameters with simple operations and smooth switching between video images at the changing of parameter values.