A wake-up device, wherein the wake-up device is associated with at least two to-be-woken-up devices, the wake-up device comprises a first interface and a second interface, each to-be-woken-up device among the two to-be-woken-up devices comprises a third interface and a fourth interface, the first interface communicates with the third interface of each to-be-woken-up device among the at least two to-be-woken-up devices in a first communication mode, and the second interface communicates with the fourth interface of each to-be-woken-up device among the at least two to-be-woken-up devices in a second communication mode, wherein: • the first interface is configured to send a wake-up notification to the third interface of each to-be-woken-up device among the at least two to-be-woken-up devices, wherein the wake-up notification is used to notify each to-be-woken-up device among the at least two to-be-woken-up devices to wake up the fourth interface, the wake-up notification comprises a trigger indication, and the trigger indication is used to indicate that the wake-up device is to send a trigger message to each to-be-woken-up device among the at least two to-be-woken-up devices; • the second interface is configured to send the trigger message to the fourth interface of each to-be-woken-up device among the at least two to-be-woken-up devices, wherein the trigger message is used to trigger the fourth interface of each to-be-woken-up device among the at least two to-be-woken-up devices to send a wake-up acknowledgment message to the second interface of the wake-up device; characterized in that • the second interface is further configured to receive the wake-up acknowledgment message from the fourth interface of each to-be-woken-up device among the at least two to-be-woken-up devices in a multi-user communication mode, wherein the trigger message is further used to indicate a subchannel on which each of the at least two to-be-woken-up device sends the wake-up acknowledgment message, and the second interface is further configured to receive, through the subchannel corresponding to each to-be-woken-up device, the wake-up acknowledgment message sent by the corresponding to-be-woken-up device. • the first interface is configured to send a wake-up notification to the third interface of each to-be-woken-up device among the at least two to-be-woken-up devices, wherein the wake-up notification is used to notify each to-be-woken-up device among the at least two to-be-woken-up devices to wake up the fourth interface, the wake-up notification comprises a trigger indication, and the trigger indication is used to indicate that the wake-up device is to send a trigger message to each to-be-woken-up device among the at least two to-be-woken-up devices; • the second interface is configured to send the trigger message to the fourth interface of each to-be-woken-up device among the at least two to-be-woken-up devices, wherein the trigger message is used to trigger the fourth interface of each to-be-woken-up device among the at least two to-be-woken-up devices to send a wake-up acknowledgment message to the second interface of the wake-up device; • the second interface is further configured to receive the wake-up acknowledgment message from the fourth interface of each to-be-woken-up device among the at least two to-be-woken-up devices in a multi-user communication mode, wherein the trigger message is further used to indicate a subchannel on which each of the at least two to-be-woken-up device sends the wake-up acknowledgment message, and the second interface is further configured to receive, through the subchannel corresponding to each to-be-woken-up device, the wake-up acknowledgment message sent by the corresponding to-be-woken-up device.