A position relationship determining method and apparatus includes determining a position relationship between a first wireless local area network (WLAN) device and a second WLAN device based on exceeded-bandwidth wireless channel characteristic data, where the exceeded-bandwidth wireless channel characteristic data is a result obtained after combining wireless channel characteristic data corresponding to all WLAN channels in a channel set, the channel set includes at least two WLAN channels, all the WLAN channels in the channel set belong to a single WLAN frequency band, a total bandwidth occupied by all the WLAN channels in the channel set is greater than 160 megahertz and is greater than a maximum single channel bandwidth supported by the single WLAN frequency band.