PURPOSE:To also extract the wrong characters or missed characters of a sen tence while enabling high-speed retrieval and reducing memory capacity. CONSTITUTION:A character index is generated to sort all the characters contained in the respective words of a word dictionary one by one and to define preserving positions in the respective words of the word dictionary as an index list and for the morpheme analysis of an input text, the index list of each character is extracted from the character index concerning the character string of the input text. When the index list is continued, the character string is judged as one word and concerning the character string for which the word is not judged, it is judged that wrong characters, missed characters or any frequent character exists at the discontinuous part.
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