20. The computer readable medium according to claim 19 , wherein said selecting further comprises: selecting said dominant keyword based on a highest-ranked output value calculated for said each retrieved keyword; and retrieving said at least one category associated with said dominant keyword from said keyword database.
20. The computer readable medium according to claim 19 , wherein said selecting further comprises: selecting said dominant keyword based on a highest-ranked output value calculated for said each retrieved keyword; and retrieving said at least one category associated with said dominant keyword from said keyword database. 21. The computer readable medium according to claim 20 , wherein said selecting further comprises: retrieving said set of statistical parameters corresponding to said each retrieved keyword; assembling a vector containing said set of statistical parameters for said each retrieved keyword; and calculating said output value for said each retrieved keyword based on said vector, said output value indicating a probability that a corresponding retrieved keyword is selected as said dominant keyword.