Method and system for updating user vocabulary synchronouslly

A method for synchronous-updating user lexicon includes pressing storage space using to store user lexicon at server end, up-transmitting different entry in comparison of local user lexicon with server end user lexicon to server end when trigger condition is satisfied and updating server end user lexicon by server based on compared data, downloading different entry in comparison of server end user lexicon with local user lexicon to local computer when trigger condition is satisfied and updating local user lexicon by local computer based on compared data.