2. The method in accordance with claim 1 wherein each of said first frequencies is stored indirectly as a product of the corresponding probability and the corresponding second frequency for a given word.
2. The method in accordance with claim 1 wherein each of said first frequencies is stored indirectly as a product of the corresponding probability and the corresponding second frequency for a given word. 3. The method in accordance with claim 2 wherein each of the probabilities of the said probabilistic model into which adaptation data is to be inputted have been subjected to smoothing operation.