7. The speech recognition method according to claim 6 , wherein said characteristic information includes relevant information relating to input speech and said recognition model includes acoustic models and language models; and wherein said model selection step selects an acoustic model among said acoustic models based on said language information and selects a language model among said language models based on said subject information and said relevant information and selects translation dictionary information among said translation dictionaries based on said language information for translation.
6. The speech recognition method according to claim 5 , wherein said model selection step selects said acoustic model and said translation dictionary information each for a user based on said dialect information of each user.