Punctuation adding method and system

The invention discloses a punctuation adding method and system. The method comprises the steps as follows: dividing a to-be-processed audio file into at least one to-be-processed phrase on the basis of silence detection, and recognizing all feature units which appear in the to-be-processed audio file according to each word and the semantic feature of each word contained in each to-be-processed phrase; determining the comprehensive weight of various punctuation states of the to-be-processed audio file according to all the feature units by using a language model established on the basis of word segmentation and semantic features of words; adding punctuations to the to-be-processed audio file according to the comprehensive weight. With the adoption of the punctuation adding method and system, the punctuation adding accuracy can be improved.