4. The message decoding method as claimed in claim 1 further comprising: the processing module determining whether the repetition value is greater than a threshold; and the processing module deleting the first word group from the word group handling buffer when the repetition value is not greater than the threshold.
5. The message decoding method as claimed in claim 4 further comprising: saving the second word group to the word group handling buffer, and defining a repetition value of the second word group as an initial value.