1. A system to provide a search result, the system comprising: a search term reception unit to receive a search term; a processor to extract 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; a search result providing unit to provide 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; and a neighbor information extraction unit to extract information corresponding to at least one neighbor having interests corresponding to interests of a user, the information corresponding to the at least one neighbor being based, at least in part, on a profile of the user, the profile being configured using keywords in a document prepared by the user, and the search term being received from the user, the keywords being time-variable and corresponding to keywords having the highest frequency of occurrence in the document.
1. A system to provide a search result, the system comprising: a search term reception unit to receive a search term; a processor to extract 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; a search result providing unit to provide 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; and a neighbor information extraction unit to extract information corresponding to at least one neighbor having interests corresponding to interests of a user, the information corresponding to the at least one neighbor being based, at least in part, on a profile of the user, the profile being configured using keywords in a document prepared by the user, and the search term being received from the user, the keywords being time-variable and corresponding to keywords having the highest frequency of occurrence in the document. 8. The system of claim 1 , wherein the search result providing unit is configured to provide the document associated with the at least one of the first personal network and the second personal network as a search result of the search term by arranging the document 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.