15. A computer-readable storage device having instructions stored which, when executed by a computing device, cause the computing device to perform operations comprising: generating text based on speech contained in an audio stream received via a personal communication device associated with a user; identifying a key phrase in the text based on one of an emotion, a speech rate, and a prosody of the key phrase in the audio stream; receiving from an advertiser an advertisement related to the key phrase; and instructing the personal communication device to display the advertisement.
15. A computer-readable storage device having instructions stored which, when executed by a computing device, cause the computing device to perform operations comprising: generating text based on speech contained in an audio stream received via a personal communication device associated with a user; identifying a key phrase in the text based on one of an emotion, a speech rate, and a prosody of the key phrase in the audio stream; receiving from an advertiser an advertisement related to the key phrase; and instructing the personal communication device to display the advertisement. 19. The computer-readable storage device of claim 15 , wherein the audio stream comprises a plurality of audio streams, each of the plurality of audio streams containing speech from the user.