A video processor includes: a judgement section configured to judge whether an input is a 2D or 3D image signal; an LR synthesis section configured to embed left and right image signals into an image signal in a side-by-side format to output the signal if the input is the 3D image signal and configured to embed a 2D image signal into a position corresponding to one of the left and right in an image signal in a side-by-side format to output the signal if the input is the 2D image signal; and an image processing section configured to apply image processing to the image signal in the side-by-side format.