An access point (AP), comprising: a signaling sending unit , configured to send first signaling to a first station (STA1), wherein the first signaling is used to instruct to enable a bandwidth power saving mode, and to indicate a first channel set available to the first station (STA1); wherein total bandwidth of channels in the first channel set is less than bandwidth of available channels of the access point (AP) and wherein when the bandwidth power saving mode of the first station is enabled, the maximum available transmission bandwidth is less than available transmission bandwidth of a system; a first data transceiver unit , configured to receive data, by using an operating channel of the first station (STA1) that is in the bandwidth power saving mode, wherein the operating channel of the first station (STA1) is a subset of the first channel set and occupies a part of available bandwidth resources of the access point (AP); and, a second data transceiver unit , configured to receive data by using an operating channel of a second station (STA2), wherein the operating channel of the second station (STA2) is an available channel in another channel set indicated by the access point (AP) for the second station (STA2) and the operating channel of the second station (STA2) occupies another part of available bandwidth resources of the access point (AP) than the operating channel of the first station, and the operating channel of the first station (STA1) and the operating channel of the second station (STA2) form all or a part of available channels of the access point (AP); wherein the operating channel of the first station (STA1) and the operating channel of the second station (STA2) do not overlap. a signaling sending unit , configured to send first signaling to a first station (STA1), wherein the first signaling is used to instruct to enable a bandwidth power saving mode, and to indicate a first channel set available to the first station (STA1); wherein total bandwidth of channels in the first channel set is less than bandwidth of available channels of the access point (AP) and wherein when the bandwidth power saving mode of the first station is enabled, the maximum available transmission bandwidth is less than available transmission bandwidth of a system; a first data transceiver unit , configured to receive data, by using an operating channel of the first station (STA1) that is in the bandwidth power saving mode, wherein the operating channel of the first station (STA1) is a subset of the first channel set and occupies a part of available bandwidth resources of the access point (AP); and, a second data transceiver unit , configured to receive data by using an operating channel of a second station (STA2), wherein the operating channel of the second station (STA2) is an available channel in another channel set indicated by the access point (AP) for the second station (STA2) and the operating channel of the second station (STA2) occupies another part of available bandwidth resources of the access point (AP) than the operating channel of the first station, and the operating channel of the first station (STA1) and the operating channel of the second station (STA2) form all or a part of available channels of the access point (AP); wherein the operating channel of the first station (STA1) and the operating channel of the second station (STA2) do not overlap. <EOS>