1. A controllable prosody re-estimation system, comprising: a controllable prosody parameter interface for loading a controllable parameter set; and a speech/text to speech (STS/TTS) core engine, said core engine including at least a prosody prediction/estimation module, a prosody re-estimation module and a speech synthesis module, wherein said prosody prediction/estimation module predicts or estimates prosody information according to the input text/speech, and transmitting the predicted or estimated prosody information to said prosody re-estimation module; said prosody re-estimation module produces new prosody information according to said input controllable parameter set and predicted/estimated prosody information. Then, said prosody re-estimation module transmits said new prosody information to said speech synthesis module to generate synthesized speech.