4. The method as claimed in claim 1 , wherein, in response to a selection command with respect to the similar word list being received, setting the execution command comprises setting a similar word corresponding to the selection command as the execution command.
4. The method as claimed in claim 1 , wherein, in response to a selection command with respect to the similar word list being received, setting the execution command comprises setting a similar word corresponding to the selection command as the execution command. 5. The method as claimed in claim 4 , wherein the similar word list comprises a list including similar words other than the target word and different symbolic letters being matched with the other similar words, wherein, in response to the selection command being an uttered voice related to a symbolic letter, setting the execution command comprises setting a similar word which is matched to correspond with a symbolic letter similar to the uttered voice from among the similar words in the similar word list as the execution command.