Disclosed are a method, device, and system for implementing network access, and a network system. The method comprises: in the case that a terminal requests to access a webpage, a server determining content of the webpage that the terminal requests to access; and the server searching for a webpage, used as a reference webpage, with relevant content matching the content of the webpage, and providing information of the found reference webpage for the terminal. The present invention can enable a user terminal to obtain multiple associated access results by performing webpage access once. Even though the terminal cannot for some reason access a webpage originally expected to be accessed, or content of a webpage originally expected to be accessed cannot meet a user requirement, has a bad display effect, or even cannot be displayed, other webpages with associated or same content can be provided for the terminal, so that a webpage that comprises sufficient information, has a better display effect, and is securer is provided for the terminal, thereby avoiding an additional access operation of the terminal and improving the browsing efficiency and experience of a user.