System and method for updating language model

The invention provides a system and method for updating a language model (LM). The system comprises a local text set generation unit and an LM updating unit, wherein the local text set generation unit is used for generating a local text set by using text data input to a mobile device and the text data received by the mobile device; and the LM updating unit is used for updating a previously installed initial LM in the mobile device based on the local text set. According to the system and the method, the problem of mismatching between the LM and application requirements in the prior art is solved; and according to the system and method for updating the LM, the LM can be dynamically and frequently updated according to codes of language and concerned topics of a specific user and occurring language phenomenon.