A double/multi window processing apparatus for a TV system is disclosed. The apparatus has a first luminance/chrominance separation unit for separating a luminance signal Ym and chrominance signal Cm from the combined image signals of the main image outputted from the intermediate frequency processing unit. A second luminance/chrominance separation unit separates the luminance and chrominance components from the combined image signals CVBS1 and CVBS2 of the main image and a sub-image outputted from the intermediate frequency processing unit and coincides the same. The second luminance/chrominance separation unit combines the synchronous-coincided luminance and chrominance signals and generates double window luminance Yp and chrominance Cp signals. A luminance/chrominance switching unit switches the luminance Yp and chrominance Cp signals of the first and second luminance/chrominance separation units and outputs one luminance Y and chrominance signal. An image processing unit receives the luminance and chrominance signals of the luminance/chrominance switching unit and displays the primary signals R, G and B on a display unit.