1. An information exchange method for online collaborative shopping, the method comprising: sending, by a main control user end, a collaborative shopping request message, wherein the collaborative shopping request message comprises one or more user identifiers, and the one or more user identifiers are used to determine a collaborative user end requested to collaborate in shopping; receiving, by the main control user end, a first response message for responding to the collaborative shopping request message by the collaborative user end corresponding to the one or more user identifiers; transmitting, by the main control user end, collaborative information to the collaborative user end according to the first response message, wherein the collaborative information comprises shopping information of the main control user end, so that the collaborative user end synchronously shares or acquires the shopping information of the main control user end; or receiving, by the main control user end according to the first response message, collaborative information sent by the collaborative user end, so that the main control user end synchronously shares or acquires shopping information of the collaborative user end, wherein the collaborative information comprises the shopping information of the collaborative user end.