13. The method of claim 12 wherein said step of identifying pervasive theme area further comprises the steps: creating a list of all phrases sorted and ordered in accordance with frequency of occurence of said phrases; sorting said ordered phrases in accordance with a user pre-specified user-interest criteria; defining pervasive theme areas from said user interest phrases; and selecting the number of said phrases to be used as pervasive theme areas.
12. The method of claim 11 wherein the step of identifying pervasive theme areas (PTA) which are closely related further comprises the steps of: a. defining threshold values above some predetermined number for the figures of merit for selecting phrases; b. selecting, from the list of extracted phrases for each PTA, phrases of high user interest having figures of merit above the threshold; c. computing commonality of extracted phrases among the different phrases in terms of the numbers of phrases in common among PTA, or equivalent; and, d. generating groups of PTA such that each PTA in a given group has extracted phrases in common with at least one other PTA in the group.