METHOD, SYSTEM, AND COMPUTER READABLE RECORDING MEDIUM FOR GENERATING KEYWORD PAIRS FOR SEARCH ADVERTISEMENTS BASED ON ADVERTISEMENT PURCHASE HISTORY

1 . A method of generating correlated information between search keywords, the method comprising:

acquiring a set of search keywords for each of advertisers having purchased or attempted to purchase the search keywords to place search advertisement or to make an attempt to place the search advertisement;

selecting at least two search keywords among the set of keywords;

generating a keyword pair of the selected search keywords correlated to each other; and

storing information regarding the generated keyword pair.

2 . The method of claim 1 , wherein the information regarding the generated keyword pair comprises a degree of correlation between the search keywords included in keyword pair.

3 . The method of claim 2 , wherein the degree of correlation is determined based on statistical information regarding the keyword pair.

4 . The method of claim 3 , wherein the statistical information comprises a number of advertisers having purchased or attempted to purchase the search keywords included in keyword pair.

5 . The method of claim 4 , wherein the degree of correlation is determined by additionally considering a number of times that users perform searches using the search keywords of the keyword pair, a number of times that advertisers have purchased or attempted to purchase the search keywords of the keyword pair, or both the number of times that users perform searches using the search keywords of the keyword pair and the number of times that advertisers have purchased or attempted to purchase the search keywords of the keyword pair.

6 . The method of claim 2 , further comprising:

providing the information regarding the keyword pair to another advertiser who wants to purchase the search keywords.

7 . The method of claim 6 , wherein providing the information regarding the keyword pair to another advertiser comprises providing information regarding upper n search keywords having relatively high degrees of correlation with a certain search keyword when the other advertiser inputs the certain search keyword as a query.

8 . A method of providing information regarding correlated keywords related to search keywords that an advertiser wants to purchase, the method comprising:

receiving information regarding a first search keyword from a certain advertiser;

acquiring a second search keyword related to the first search keyword, the second search keyword representing a search keyword associated with any other advertiser having purchased or attempted to purchase the first search keyword; and

providing information regarding the acquired second search keyword to the specific advertiser.

9 . A system for generating correlated information between search keywords, the system comprising

an advertiser interface unit configured to provide an interface which allows advertisers to purchase the right to place search advertisement therethrough;

a history database configured to store history of a series of behaviors performed by advertisers upon inquiry about and purchase of search keywords through the advertiser interface unit;

a history analyzer configured to acquire, from the history database, a set of search keywords that a certain advertiser has purchased or attempted to purchase, to select at least two search keywords among the set of keywords, and to generate a keyword pair of the selected search keywords correlated to each other; and

a correlation list generator configured to store information regarding the generated keyword pair.

10 . The system of claim 9 , further comprising:

a correlation degree calculator configured to calculate a degree of correlation between the search keywords included in the keyword pair, the information regarding the generated keyword pair comprising the degree of correlation.

11 . The system of claim 10 , wherein the correlation degree calculator is configured to calculate the degree of correlation based on statistical information regarding the keyword pair.

12 . The system of claim 11 , wherein the statistical information comprises the number of advisers having purchased or attempted to purchase the search keywords included in the keyword pair.

13 . The system of claim 12 , wherein the degree of correlation is determined by additionally considering a number of times that users perform searches using the search keywords of the keyword pair, a number of times that advertisers have purchased or attempted to purchase the search keywords of the keyword pair, or both the number of times that users perform searches using the search keywords of the keyword pair and the number of times that advertisers have purchased or attempted to purchase the search keywords of the keyword pair.

14 . The system of claim 10 , wherein the advertiser interface unit is configured to provide the information regarding the keyword pair to another advertiser who wants to purchase the search keywords.

15 . The system of claim 14 , wherein the advertiser interface unit is configured to provide information regarding upper n search keywords having relatively high degrees of correlation with respect to a certain search keyword when the other advertiser input the certain search keyword as a query.

16 . A system for providing information regarding correlated keywords related to search keywords that an advertiser wants to purchase, the system comprising:

an advertiser interface unit configured to receive information regarding a first search keyword from a specific advertiser and to provide information regarding a set of second search keywords to the specific advertiser, the set of second search keywords being related to the first search keyword; and

a correlated keyword management unit configured to generate a keyword pair of the first search keywords and the second search keyword correlated to each other and to provide information regarding the set of second search keywords to the advertiser interface unit in response to a request from the advertiser interface, the second search keyword representing a search keyword associated with a certain advertiser having purchased or attempted to purchase the first search keyword.

17 . A computer readable recording medium for recording a computer program for implementing the method according to claim 1 .