Patent ID: 7216122

Claim:
An information processing device comprising: acquisition means for acquiring data for pages of a site; extraction means for extracting words appearing within said pages using said data for said pages acquired by said acquisition means; counting means for counting a number of times said words extracted by said extraction means appear within each page; first generating means for analyzing a link structure among said pages acquired by said acquisition means and for generating a first weighting corresponding to pages which are in link relationships, the generating of said first weighting involving the use of at least one count value which is a number of appearances of a word as counted by said counting means; second generating means for generating a second weighting corresponding to pages which are in a link relationship with a predetermined page of said pages, the generating of said second weighting involving the use of said first weighting; third generating means for generating at least one of sibling document frequency (SDF) data and coparent document frequency (CDF) data using said second weighting generated by said second generating means; and calculating means for calculating a page model extension value through page model extension processing based on at least one of inverse sibling document frequency (ISDF) and inverse coparent document frequency (ICDF) using said data generated by said third generating means.