1. A hint information description method comprising: receiving metadata hint information for manipulation of metadata composed of at least one descriptor describing semantic content, a structure, and characteristics of content; and describing, by utilizing a hint information analysis unit, as said metadata hint information, a location of a syntax file defining syntax of the metadata; setting, by utilizing a metadata regeneration condition setting unit, a metadata re-generation condition based on a result of analysis outputted from the hint information analysis unit wherein the condition setting corresponds to selection of each descriptor that is unnecessary for the metadata regeneration condition setting unit from among various descriptors contained in the metadata hint information; and regenerating the metadata based on said metadata hint information and the location of the syntax file defining syntax of the metadata satisfying said metadata re-generation condition.