2. The audio analysis system according to claim 1 , wherein the terminal apparatus further includes a second audio acquisition device disposed at a position where a sound pressure of an utterance-based sound that arrives from the mouth of the user differs from a sound pressure of the utterance-based sound that arrives at the first audio acquisition device, the second audio acquisition device acquiring the sound and converting the sound into a second audio signal, wherein the discriminator discriminates between a portion that corresponds to the utterance of the user and a portion that corresponds to the utterance of the other person which are contained in the first audio signal, on the basis of a result of comparing the first audio signal with the second audio signal, and wherein the utterance feature detector detects an utterance feature of the user or the other person, on the basis of the portion that corresponds to the utterance of the user or the portion that corresponds to the utterance of the other person which is contained in the first audio signal or the second audio signal.
2. The audio analysis system according to claim 1 , wherein the terminal apparatus further includes a second audio acquisition device disposed at a position where a sound pressure of an utterance-based sound that arrives from the mouth of the user differs from a sound pressure of the utterance-based sound that arrives at the first audio acquisition device, the second audio acquisition device acquiring the sound and converting the sound into a second audio signal, wherein the discriminator discriminates between a portion that corresponds to the utterance of the user and a portion that corresponds to the utterance of the other person which are contained in the first audio signal, on the basis of a result of comparing the first audio signal with the second audio signal, and wherein the utterance feature detector detects an utterance feature of the user or the other person, on the basis of the portion that corresponds to the utterance of the user or the portion that corresponds to the utterance of the other person which is contained in the first audio signal or the second audio signal. 4. The audio analysis system according to claim 2 , wherein the terminal apparatus includes a main body, and a strap that is to be connected to the main body and hung around the neck of the user, and wherein in a state where the strap is hung around the neck of the user, the first audio acquisition device is located in the main body or at part of the strap that is separate from the mouth of the user by approximately 30 to 40 centimeters, and the second audio acquisition device is located at part of the strap that is separate from the mouth of the user by approximately 10 to 20 centimeters.