24. The method of claim 21 , wherein indexing the at least one converted word comprises indexing the at least one converted word according to the suffix of the syllable unit, in response to a determination that the setting mode is the suffix index of the syllable unit.
21. The method of claim 20 , wherein the setting mode comprises selection information about at least one of a prefix index of the consonant/vowel unit, a prefix index of the syllable unit, and a suffix index of the syllable unit, and wherein determining the at least one autocomplete recommended word comprises determining the at least one autocomplete recommended word from a recommended word index database using the selected index.