Abstract: A method including acquiring user behavior data generated in a first service module of a commodity information service system, wherein the user behavior data includes behavior data generated in a process of a user interacting with the first service module by browsing commodity information published therein; determining, by analyzing the user behavior data, a target user having a commodity purchase intention and having difficulty in finding or deciding on commodities in the first service module; and after the target user is determined, re-engaging the target user with a second service module of the commodity information service system so that the target user may initiate a purchase form in the second service module and interact therewith. Through the embodiments of the present disclosure, the user re-engagement efficiency is improved, and resource waste is reduced.