5. The speech recognition apparatus according to claim 1 , wherein the threshold level is referred to as a first predetermined level, wherein, when the control unit determines that the likelihood level of the selected candidate is lower than the first predetermined level and equal to or higher than a second predetermined level, the control unit controls the output unit to output both the first recognition result and the second recognition result, and wherein the second predetermined level is lower than the first predetermined level.
5. The speech recognition apparatus according to claim 1 , wherein the threshold level is referred to as a first predetermined level, wherein, when the control unit determines that the likelihood level of the selected candidate is lower than the first predetermined level and equal to or higher than a second predetermined level, the control unit controls the output unit to output both the first recognition result and the second recognition result, and wherein the second predetermined level is lower than the first predetermined level. 10. The speech recognition apparatus according to claim 5 , wherein, when the control unit determines that the likelihood level of the selected candidate is lower than the second predetermined level, the control unit controls the output unit to output only the second recognition result.