1. A system for providing an autocomplete recommended word, the system comprising: a recommended word database storing and maintaining a recommended word list; a recommended word indexer module converting the recommended word list of a first language which is stored in the recommended word database to a converted word for indexing of a second language which is associated with the first language, and indexing the converted word for indexing according to any one of a consonant/vowel unit and a syllable unit; a recommended word index database storing the converted word for indexing and the recommended word list of the first language which corresponds to the converted word for indexing for each of any one of consonant/vowel unit index and syllable unit index; and a query autocompletion server receiving a query of the second language from a predetermined web server, extracting an autocomplete recommended word of the first language which is associated with the query of the second language from the recommended word index database, and transmitting the autocomplete recommended word of the first language to the web server.