1. A user interest pattern modeling server, comprising: a history collection unit configured to collect a user's use history of a content; a keyword extraction unit configured to extract a keyword from the use history of the content; a time pattern extraction unit configured to extract a first time pattern of the keyword; a keyword extension unit configured to extract an extended keyword through searching related words of the keyword; a time pattern analysis unit configured to analyze a second time pattern of the extended keyword based on the first time pattern; and a pattern modeling unit configured to model a user interest pattern for the keyword and the extended keyword based on the first and second time patterns.