Voice recognition apparatus and control method thereof

A voice recognition method performed by a processor, the method comprising:

• extracting utterance elements from an uttered voice of a user;
• converting the extracted utterance elements into lexico-semantic pattern (LSP) formats;
• determining whether an utterance element related to an Out Of Vocabulary (OOV) exists among the utterance elements converted into the LSP formats with reference to vocabulary list information comprising pre-registered vocabularies;
• and
• determining an Out Of Domain (OOD) area in which it is impossible to provide response information in response to the uttered voice, in response to determining that the utterance element related to the OOV exists.

A voice recognition apparatus comprising:

• a display;
• and
• a processor which is configured to determine whether voice of a user contains words which are non-matchable to content providing domains by:
• extracting utterance elements from the voice;
• converting the extracted utterance elements into lexico-semantic pattern (LSP) formats;
• determining a presence of an Out Of Vocabulary (OOV) utterance element, among the converted utterance elements, based on pre-registered vocabularies;
• determining that the voice contains an Out Of Domain (OOD) area which is non-matchable with the content providing domains, in response to the presence of the OOV utterance element;
• and
• providing a message informing the user of the non-matchable word present in the voice of the user.