6. The speech recognition apparatus according to claim 3 , wherein the recognition data is registered in the recognition dictionary, the recognition data including the target character and the information on the sound data in association with each other, the sound data representing the pronunciation of the successive character string including the predetermined character string and a predetermined number of repetitions of the target characters subsequent to the predetermined character string.
3. A speech recognition apparatus operated by a computer for recognizing an utterance by a user, comprising: a user information processor that receives user information inputted into the computer from an external device and generates user input method information representing an utterance method of the user; a sound input device that is connected to the computer to receive a successive character string uttered by the user and convert the successive character string into sound data formed of digital signals; a recognition dictionary; and a speech recognition processor that receives the utterance method of the user from the user information processor and the sound data from the sound input device so as to perform a speech recognition process using the recognition dictionary, wherein: the speech recognition processor requests a recognition data that is registered in the recognition dictionary and corresponds to the utterance method of the user, the recognition data including a target character to be recognized and information on the sound data in association with each other, the sound data representing a pronunciation of the successive character string including a predetermined character string and the target character subsequent to the predetermined character string, the speech recognition processor recognizes the target character from the sound data using a feature of acoustic model representing the target character, and the predetermined character string is a Chinese character string which enhances sound energy of a first phoneme of the target character when the successive character string is uttered, and pronounces as being classified into a third tone of Chinese tones and has a single syllable; and an output device that outputs the target character recognized by the speech recognition processor to a display device of the computer.