12. A system for searching for a related term having rapidly increasing popularity, the system comprising: a storage device; a database, stored on the storage device, and configured to store a search log; an extraction unit to analyze the search log and extract daily search frequency for search terms in the search log; a comparison unit to analyze the search log and compare the extracted daily search frequency for the search terms; and a filtering unit to analyze relevance between candidate search terms in which peaks have occurred together in a period with at least one of the search terms as a result of the comparison and to filter out a candidate search term of the candidate search terms having no relevance to the search terms; wherein the extraction unit is operable to, extract the daily search frequency for the search terms within the period, analyze the daily search frequency for the search terms, extract at least one search term having a search frequency that increases more rapidly than an increase reference value that decreases more rapidly than a decrease reference value, and extract time information when a peak of the at least one search term has occurred.
13. The system of claim 12 , wherein the comparison unit is operable to compare the peaks of the extracted daily search frequency for the search terms in the period, and search for candidate search terms for which peaks have occurred together in the period with at least one of the search terms as the result of the comparison.