To obtain a precise morpheme analysis result by adding a small number of pieces of information as small as possible.

A morpheme analysis method complementarily combines designated information E designated by a user and language analysis information obtained from a dictionary I for morpheme analysis by a dictionary look-up means F by using a language analysis information generation means G for analyzing languages by a language analysis means H. All of the language analysis information needs not be defined in sentence data in advance, and only one portion of the language analysis information may be defined, thus solving complexity in sentence input at a user side.