A method and system for searching a first content group stored in a user terminal using given keywords, displaying a search result in a list using a web browser, and storing IDs corresponding to content referred to by the user in a reference history storage unit. After this, when the user searches a second content group stored in the support server, the server receives keywords and reference history from the user terminal and searches the second content group using the keywords. The server then determines whether or not the ID of retrieved content exists in the reference history, and displays contents with IDs in the reference history and content with IDs not existing in the reference history in such a manner that the contents are distinguishable from each other with the Web browser of the user terminal.