Intelligent inputing of sentence

A method for inputting a sentence intelligently is provided to complete the sentence without completely inputting all spells of words by completing the words with an auto-filling function. Unknown characters are inputted with character buttons. Unknown words for the unknown characters are generated through a dictionary database by combining the characters and are stored in a word database. Unknown sentences are generated by combining the unknown words and are temporarily stored in a sentence database. The unknown sentences are recognized through an AI(Artificial Intelligence) language interpreter. Priority is assigned to the sentences stored in the sentence database by determining order of natural interpretation of the interpreted sentences. The unknown sentences are displayed to a user in the order of the natural interpretation. The user selects the desired sentence among the displayed unknown sentences when the desired sentence is found, and performs previous stages repeatedly by checking the unknown characters or words when the desired sentence is not found.