1. A method for assigning word prominence in synthetic speech comprising: determining, through a processor, whether an information in a current sentence is new or previously given based on a semantic relationship in a vector space between the current sentence and a number of preceding sentences; assigning, through the processor, a word prominence for the synthetic speech to a word in the current sentence in accordance with the information determination; and generating, through an output device, a speech representative of the current sentence.
8. The method of claim 1 , wherein assigning a word prominence to a word in the current sentence includes: emphasizing the word in the current sentence when the word represents the new information; and de-emphasizing the word in the current sentence when the word represents the previously given information.