12. A system for providing keyword ranking, the system comprising: a storage device configured to store a keyword set that comprises keywords input to search an Internet search environment as search queries; and a processor comprising: a common affix extraction unit configured to extract a common affix using a keyword set, the common affix extraction unit including, a keyword counter configured to count keywords including each of a plurality of affixes with a common attribute in a keyword set, and an affix ranking calculation unit configured to calculate a ranking of each affix using the counting result of the keywords and to extract the common affix and by applying a weight to the counting result of the keywords based on an attribute of each affix, the weight according to the attribute of each affix increases as query counts of each affix being a keyword itself increase; a keyword ranking providing unit configured to provide ranking of keywords which include the extracted common affix; and a regular expression establishment unit configured to establish a regular expression using the extracted common affix and a search combination symbol.
12. A system for providing keyword ranking, the system comprising: a storage device configured to store a keyword set that comprises keywords input to search an Internet search environment as search queries; and a processor comprising: a common affix extraction unit configured to extract a common affix using a keyword set, the common affix extraction unit including, a keyword counter configured to count keywords including each of a plurality of affixes with a common attribute in a keyword set, and an affix ranking calculation unit configured to calculate a ranking of each affix using the counting result of the keywords and to extract the common affix and by applying a weight to the counting result of the keywords based on an attribute of each affix, the weight according to the attribute of each affix increases as query counts of each affix being a keyword itself increase; a keyword ranking providing unit configured to provide ranking of keywords which include the extracted common affix; and a regular expression establishment unit configured to establish a regular expression using the extracted common affix and a search combination symbol. 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.