Patent US 9,547,716

A speech search method performed by a display device, the method including outputting media data including audio data, receiving a speech search command for additional data about the outputted media data from a user, the speech search command including at least one query word, determining whether the at least one query word matches a query term that is full and searchable, when the at least one query word matches the query term that is full and searchable, performing a search for the additional data using the query term, and when the at least one query word does not match the query term that is full and searchable, determining the query term from a predetermined amount of the audio data prior to receiving the speech search command and performing the search for the additional data using the query term.