10. A method for searching within a computer system comprising a processor and a memory for personalized content based on a user's comment, the method comprising: receiving a user query from a user terminal, the user query Including one or more terms; analyzing the user's comment on the received user query and extracting the user's preferred terms, wherein the user query and the user's comment are made by the same user, and the user's comment is the user's assessment of each piece of content; selecting at least one term from the extracted terms and extending the user query by generating a query set which includes both the user query and the selected term, the query set including a plurality of terms used to request content from a database, the plurality of terms including both the one or more terms included in the user query and the selected term; searching within the computer system for pieces of content based on a query set; and providing information about the found pieces of content to the user.
10. A method for searching within a computer system comprising a processor and a memory for personalized content based on a user's comment, the method comprising: receiving a user query from a user terminal, the user query Including one or more terms; analyzing the user's comment on the received user query and extracting the user's preferred terms, wherein the user query and the user's comment are made by the same user, and the user's comment is the user's assessment of each piece of content; selecting at least one term from the extracted terms and extending the user query by generating a query set which includes both the user query and the selected term, the query set including a plurality of terms used to request content from a database, the plurality of terms including both the one or more terms included in the user query and the selected term; searching within the computer system for pieces of content based on a query set; and providing information about the found pieces of content to the user. 11. The method of claim 10 , wherein the extracting of the user's preferred terms comprises extracting the user's preferred terms related to the user query from the information about the user's comment using a TF-IDF technique.