13. The system of claim 12 , wherein the keyword counter is configured to count a number of types of the keywords including each affix or a total query count of searching for the keywords.
13. The system of claim 12 , wherein the keyword counter is configured to count a number of types of the keywords including each affix or a total query count of searching for the keywords. 16. The system of claim 13 , wherein the affix ranking calculation unit is configured to calculate the ranking of each affix by applying a weight to a first score and a second score, the first score being generated by converting the number of types of the keyword and the second score being generated by converting the total query count of searching for the keywords.