1. A browser for performing webpage search, comprising: a window generator configured to generate a first sub-window and a second sub-window in a browser webpage window of the browser; a first sub-window loader configured to load content in the first sub-window of the browser webpage window, wherein the loaded content of the first sub-window includes search category list information and search engine list information corresponding to search categories in the search category list information, to enable a user to select a search category and a search engine; a search request generator configured to initiate a search request to the search engine selected from the search engine list information corresponding to the search category according to the search category selected from the search category list information and a search key word input at the browser side; and a search result loader configured to load in the second sub-window of the browser webpage window a search result returned by the search engine selected from the search engine list information according to the search request.