2. The operator evaluation support device according to claim 1 , wherein the speech recording unit is configured to record an average-volume-in-speech in association with the speech time of the customer, and the problematic superposition identifying unit is configured to acquire, from the speech recording unit, the average-volume-in-speech of the speech of the customer that has started after the superposition speech, compare the average-volume-in-speech of the speech of the customer that has started after the superposition speech with a standard average volume, and identify the superposition speech as the problematic superposition speech when the average-volume-in-speech of the speech of the customer that has started after the superposition speech is higher than the standard average volume.
2. The operator evaluation support device according to claim 1 , wherein the speech recording unit is configured to record an average-volume-in-speech in association with the speech time of the customer, and the problematic superposition identifying unit is configured to acquire, from the speech recording unit, the average-volume-in-speech of the speech of the customer that has started after the superposition speech, compare the average-volume-in-speech of the speech of the customer that has started after the superposition speech with a standard average volume, and identify the superposition speech as the problematic superposition speech when the average-volume-in-speech of the speech of the customer that has started after the superposition speech is higher than the standard average volume. 3. The operator evaluation support device according to claim 2 , wherein the problematic superposition identifying unit is configured to refer to the speech recording unit with respect to the telephone call, calculate an average value of the average-volume-in-speeches of the customer, and set the average value as the standard average volume.