A mobile terminal including a wireless communication unit configured to wirelessly communicate with at least one other terminal; a memory configured to store recorded voice data; a display unit configured to display a graphic object representing a reproduction progress of the recorded voice data; and a controller configured to receive a selection signal indicating a portion of the graphic object has been selected, select a section of the recorded voice data including a point-in-time at which the graphic object is selected, convert keyword voice data included in the selected section of the recorded voice data to keyword text data, and display the keyword text data on the display unit.