1. A storage medium to be used with a reproducing apparatus and to store data including audio/visual (AV) data and metadata, the storage medium comprising: a plurality of scene elements of the AV data comprising a plurality of scenes; keyword elements as specific elements of the corresponding scene elements, each keyword element comprising a search keyword, which an author selectively defines, as a content of the corresponding scene element, the search keyword being used by the reproducing apparatus in searching for each scene of the AV data; and a description element, comprising a keyword value corresponding to the author-defined search keyword as content thereof, as a specific element of each keyword element, wherein the author-defined search keyword is additionally defined by an author, and enables the author to add information that is necessary to describe content of the storage medium and wherein the author defined keyword comprises a first element and a second element, the first element comprises a field and the search keyword defined by the author, the field indicating that the search keyword defined by the author is defined by the author, the second element is in a lower level of the search keyword defined by the author, and comprises an actual keyword value which specifies a particular value of the search keyword defined in the first element.