A method for operating a terminal according to one embodiment of the present invention comprises the steps of: displaying a text tool window; receiving an inputted character sequence and displaying all of the received character sequences on the displayed text tool window; receiving an input for deleting characters for deleting a portion of the character sequences from among all of the displayed character sequences; receiving an input for recovering characters for recovering the deleted portion of the character sequences; and recovering and displaying the deleted portion of the character sequences according to the received input for recovering characters.