14. The method of claim 13 , further comprising editing the word sequence, wherein the editing of the word sequence comprises: displaying information indicating the plurality of editable units; and editing the word sequence at an editable unit that is selected according to a user input signal.
14. The method of claim 13 , further comprising editing the word sequence, wherein the editing of the word sequence comprises: displaying information indicating the plurality of editable units; and editing the word sequence at an editable unit that is selected according to a user input signal. 16. The method of claim 14 , wherein the editable unit represents a location of a boundary that is positioned among speech sections corresponding to the respective words of the word sequence and which comprises an energy below a predetermined threshold value.