2. The system according to claim 1 , wherein the presenter includes a classifier for classifying the conversation between the first speaker and the second speaker based on the smoothed difference data string in order to output a classification result.
2. The system according to claim 1 , wherein the presenter includes a classifier for classifying the conversation between the first speaker and the second speaker based on the smoothed difference data string in order to output a classification result. 3. The system according to claim 2 , wherein the classifier groups conversations that have a similar pattern of the smoothed difference data string to classify a plurality of conversations.