5. A language processing apparatus as recited in claim 4, wherein said available parts of speech include noun and verb, and said estimate means includes means for estimating a location at which said second form is different from said first form, when said target morpheme is verb, and means for estimating a location at which said second form is different from said form when said target morpheme is noun.
4. A language processing apparatus as recited in claim 3, wherein said first language is English.