13. The method according to claim 10 , further comprising: identifying timestamp information on a time at which a specific frequency waveform corresponding to the part of the voice starts and a time at which the specific frequency waveform ends.
13. The method according to claim 10 , further comprising: identifying timestamp information on a time at which a specific frequency waveform corresponding to the part of the voice starts and a time at which the specific frequency waveform ends. 15. The method according to claim 13 , further comprising, when video data including the voice data is recorded: identifying each of timestamp information on start time and end time of the part of the voice data, and synchronizing the part of the voice data and the part of the video data corresponding to the part of the voice data.