The present invention provides an information exchange method, a user end, and a system for online collaborative shopping. The method includes: sending a collaborative shopping request message that includes one or more user identifiers to a collaborative server; receiving a collaborative shopping startup message; submitting a shopping web page of the main control user to the collaborative server, and submitting, to the collaborative server, operation information generated when a user of the main control user end operates a shopping web page; and receiving operation information generated when a user on the collaborative user end operates a shopping web page according to a commodity feature concerned by the user on the shopping web page, and displaying, on the shopping web page, an operation result of the user on the collaborative user end for the shopping web page.