1. An apparatus for reporting speech recognition failures, the apparatus comprising: a speech recognition failure determination unit for receiving detected speech data from an input speech signal, determining whether the speech data is compatible with a speech recognition based on a combination of check results for a plurality of speech recognition failures for the speech data, ascertaining a dominant speech recognition failure reason of a plurality of speech recognition failure reasons according to the check results when the speech data is incompatible with the speech recognition, and outputting the ascertained dominant speech recognition failure reason; and a control unit for controlling the dominant speech recognition failure reason output.