Implementations of the present specification include receiving, from a computing device, feature information of a Wi-Fi signal that is detected by the computing device, the feature information including identification information of the Wi-Fi signal; searching a database to identify one or more target objects associated with the feature information of the Wi-Fi signal, the database mapping feature information of a plurality of Wi-Fi signals to identification information of a plurality of target objects; and providing identification information of at least one target object of the one or more target objects to be displayed on the computing device.