1. An electronic device comprising: an audio processing unit configured to receive audio data, and to acquire voice data from the audio data; a control unit configured to receive or generate text data corresponding to the voice data, and to store at least part of the voice data and at least part of the text data corresponding to the at least part of the voice data, wherein the stored at least part of the voice data and the stored at least part of the text data are associated each other, and wherein the at least part of the voice data comprises one or more units; and a display unit configured to output the received or generated text data.