1. A speech recognition method, adapted to an electronic apparatus, comprising: obtaining a phonetic transcription sequence of a speech signal according to an acoustic model; obtaining a plurality of possible syllable sequences and a plurality of corresponding phonetic spelling matching probabilities according to the phonetic transcription sequence and a syllable acoustic lexicon; obtaining, from a language model, a probability of a plurality of text sequences appeared in the language model; and selecting the text sequence corresponding to a largest one among a plurality of associated probabilities to be used as a recognition result of the speech signal.