22. An information associating apparatus according to claim 19 wherein: said initialization unit further comprises a cosine calculation unit which calculates the cosine value between each key word by generating a vector for each key word using the interval association degree between a predetermined key word and each key word by using said interval association degree dictionary, and calculating the cosine value between the vectors of the two key words, and further characterized in said initialization unit generating initial groups such that by using the cosine value calculated by said cosine calculation unit the cosine value between all key words included in each group is larger that a predetermined value.
22. An information associating apparatus according to claim 19 wherein: said initialization unit further comprises a cosine calculation unit which calculates the cosine value between each key word by generating a vector for each key word using the interval association degree between a predetermined key word and each key word by using said interval association degree dictionary, and calculating the cosine value between the vectors of the two key words, and further characterized in said initialization unit generating initial groups such that by using the cosine value calculated by said cosine calculation unit the cosine value between all key words included in each group is larger that a predetermined value. 25. An information associating apparatus according to claim 22 wherein: said grouping unit groups associated words by grouping them into one group if the value of the interval association degree is greater than its threshold value, or the value of the correlation degree is greater than the threshold value of the interval association degree, or the value of the cosine found by said cosine calculation unit is larger than its threshold, for key words in which the association degree between all key words in said group and all key words on another group is the object of comparison.