11. A method for registration of a user command, the method comprising: receiving the user command; obtaining a phonetic symbol for the user command; determining whether or not the user command is suitable for a registration based on the phonetic symbol and displaying a visual indication based on a result of the determination; and providing the registration suitability determination for the user command, wherein the determining determines whether or not the user command is suitable for the registration, based on at least one of a total number of the phonetic symbol, whether or not vowels and consonants of the phonetic symbol is successive, a configuration form of the phonetic symbols, the number of phonetic symbol for each word, and whether or not a predetermined weak phonetic symbol is included in the phonetic symbol.
11. A method for registration of a user command, the method comprising: receiving the user command; obtaining a phonetic symbol for the user command; determining whether or not the user command is suitable for a registration based on the phonetic symbol and displaying a visual indication based on a result of the determination; and providing the registration suitability determination for the user command, wherein the determining determines whether or not the user command is suitable for the registration, based on at least one of a total number of the phonetic symbol, whether or not vowels and consonants of the phonetic symbol is successive, a configuration form of the phonetic symbols, the number of phonetic symbol for each word, and whether or not a predetermined weak phonetic symbol is included in the phonetic symbol. 19. The method as claimed in claim 11 , wherein in the receiving of the user command, in response to a spoken voice for the user command being input, one or more texts for the spoken voice is received from a voice recognition apparatus, and a text selected by a user among one or more input texts is determined as a text for the user command.