1. An information storage medium storing program codes for reproducing data by performing a method comprising following steps: reading, from the information storage medium: contents comprising audio/visual (AV) data; and at least one metadata file in which information regarding the contents is recorded in at least one language, the information regarding the contents being for searching for the contents; and reproducing the contents with reference to the at least one metadata file; wherein the metadata file comprises a plurality of language files in which different versions of the information regarding the contents written in different languages are provided; the different languages are identified by names of the respective language files; the names of the respective language files comprise a language identifier according to an ISO 639-2 standard; the information regarding the contents further comprises download information regarding a plurality of downloadable metadata files that are downloadable from other storage media; and the download information comprises: disc identification (ID) information identifying the information storage medium; language code information regarding different languages in which the downloadable metadata files are written; and server location information specifying a location of one or more servers in which the downloadable metadata files are stored.