1. A method of providing an answer keyword, by a device having a processor, to a user terminal, the method comprising: obtaining at least one of a search word history comprising a first inquiry search word of a certain domain pre-received from first user terminals, and webpage information selected by the first user terminals from a search result according to the search word history; extracting answer candidate keywords regarding the first inquiry search word from at least one of the search word history and the webpage information based on keyword lists of the certain domain; calculating a relation value between the first inquiry search word and each of the extracted answer candidate keywords; and when the first inquiry search word is received from a second user terminal, transmitting answer keywords for the first inquiry search word, which are selected from the answer candidate keywords based on the relation value, to the second user terminal.
1. A method of providing an answer keyword, by a device having a processor, to a user terminal, the method comprising: obtaining at least one of a search word history comprising a first inquiry search word of a certain domain pre-received from first user terminals, and webpage information selected by the first user terminals from a search result according to the search word history; extracting answer candidate keywords regarding the first inquiry search word from at least one of the search word history and the webpage information based on keyword lists of the certain domain; calculating a relation value between the first inquiry search word and each of the extracted answer candidate keywords; and when the first inquiry search word is received from a second user terminal, transmitting answer keywords for the first inquiry search word, which are selected from the answer candidate keywords based on the relation value, to the second user terminal. 7. The method of claim 1 , wherein the calculating of the relation value comprises: extracting second inquiry search words excluding the first inquiry search word from at least one of the search word history and the webpage information; calculating a similarity value between the first inquiry search word and each of the extracted second inquiry search words based on a frequency of each of the second inquiry search words being included in at least one of the search word history and the webpage information; selecting a third inquiry search word from the second inquiry search words, which is to be included in a first similar search word group together with the first inquiry search word, based on the similarity value; and revising the calculated relation value between the first inquiry search word and each of the answer candidate keywords of the first inquiry search word based on a relation value between the third inquiry search word and each of answer candidate keywords of the third inquiry search word.