11. A method that utilizes a processor to provide a search result, the method comprising: receiving a search term from a user; extracting, via the processor, information corresponding to at least one of a first personal network associated with the search term and a second personal network different than the first personal network; extracting information corresponding to at least one neighbor having interests corresponding to interests of the user based, at least in part, on a profile of the user; and providing a document associated with at least one of the first personal network and the second personal network as a search result of the search term, wherein extracting the information corresponding to the at least one neighbor comprises: providing the profile of the user using keywords provided in a document prepared by the user, the keywords being time-variable and corresponding to keywords having the highest frequency of occurrence in the document.
11. A method that utilizes a processor to provide a search result, the method comprising: receiving a search term from a user; extracting, via the processor, information corresponding to at least one of a first personal network associated with the search term and a second personal network different than the first personal network; extracting information corresponding to at least one neighbor having interests corresponding to interests of the user based, at least in part, on a profile of the user; and providing a document associated with at least one of the first personal network and the second personal network as a search result of the search term, wherein extracting the information corresponding to the at least one neighbor comprises: providing the profile of the user using keywords provided in a document prepared by the user, the keywords being time-variable and corresponding to keywords having the highest frequency of occurrence in the document. 18. The method of claim 11 , wherein the providing comprises providing the document associated with the at least one of the first personal network and the second personal network as the search result of the search term by arranging the document associated with the at least one of the first personal network and the second personal network among documents associated with the search term based on an order of net association comprising an association with respect to the search term and an association between the user providing the search term and the at least one of the first personal network and the second personal network.