2. The information apparatus according to claim 1 , the information apparatus further comprising: a mixed speech dataset generating part configured to generate a fifth speech dataset by mixing speech data of the second speech dataset with speech data of the third speech dataset in accordance with a mixture rate, wherein the acoustic model generating part generates the first acoustic model using the fifth speech dataset.
2. The information apparatus according to claim 1 , the information apparatus further comprising: a mixed speech dataset generating part configured to generate a fifth speech dataset by mixing speech data of the second speech dataset with speech data of the third speech dataset in accordance with a mixture rate, wherein the acoustic model generating part generates the first acoustic model using the fifth speech dataset. 8. The information apparatus according to claim 2 , wherein, when the first acoustic model is not improved beyond a threshold level even if the value of the mixture rate is adjusted or when a given period of time has elapsed since the start of generation of the first acoustic model, the mixture rate deciding part specifies the current first acoustic model as a final acoustic model.