1. A video signal processing apparatus for processing a video signal, comprising: a metadata notation format identification block for identifying a notation format of metadata written in a predetermined language; a conversion table selection block for selecting a conversion table corresponding to said identified notation format of said metadata from among one or more conversion tables prepared in advance; a metadata notation format conversion block for converting said notation format of said metadata into a notation format compatible with said video signal processing apparatus on the basis of said selected conversion table; and a processing control block for controlling processing associated with said video signal on the basis of said metadata whose notation format has been converted.