A clustering method, comprising: receiving, by a first device, a beacon frame comprising decentralized cluster information over a target small bandwidth channel, extracting cluster synchronization information and control information of a synchronization device in the beacon frame, and monitoring the target small bandwidth channel in a beacon service period, Beacon SP, so as to detect whether the Beacon SP is occupied by another cluster member; if the first device detects an empty Beacon SP, changing a first variable beacon interval, VBI, to a second VBI, so that a beginning of the first small bandwidth beacon transmission interval following an end of the second VBI is aligned with a beginning of the empty Beacon SP; determining whether a quotient of the second VBI divided by a synchronization device beacon interval S-BI of a target small bandwidth cluster is an integer; and if the quotient of the second VBI divided by the synchronization device beacon interval S-BI of the target small bandwidth cluster is an integer, adjusting a corresponding first small bandwidth beacon interval, SBBI, to be equal to the S-BI, and notifying a second device to adjust a corresponding second SBBI, so that a quotient of the second VBI divided by the second SBBI is an integer; or if the quotient of the second VBI divided by the synchronization device beacon interval S-BI of the target small bandwidth cluster is not an integer, changing a value of the second VBI to a value of a third VBI so that a quotient of the third VBI divided by the S-BI is an integer, adjusting a corresponding first SBBI to be equal to the S-BI, and notifying the second device to adjust a corresponding second SBBI, so that a quotient of the third VBI divided by the second SBBI is an integer; and sending a beacon frame in the empty Beacon SP on the target small bandwidth channel, setting a corresponding Clustering Control field, and joining the target small bandwidth cluster as a cluster member; wherein the first device and the second device are synchronization pair devices, and the beacon frame is a directional multi-gigabit beacon frame in a 60GHz technology. receiving, by a first device, a beacon frame comprising decentralized cluster information over a target small bandwidth channel, extracting cluster synchronization information and control information of a synchronization device in the beacon frame, and monitoring the target small bandwidth channel in a beacon service period, Beacon SP, so as to detect whether the Beacon SP is occupied by another cluster member; if the first device detects an empty Beacon SP, changing a first variable beacon interval, VBI, to a second VBI, so that a beginning of the first small bandwidth beacon transmission interval following an end of the second VBI is aligned with a beginning of the empty Beacon SP; determining whether a quotient of the second VBI divided by a synchronization device beacon interval S-BI of a target small bandwidth cluster is an integer; and if the quotient of the second VBI divided by the synchronization device beacon interval S-BI of the target small bandwidth cluster is an integer, adjusting a corresponding first small bandwidth beacon interval, SBBI, to be equal to the S-BI, and notifying a second device to adjust a corresponding second SBBI, so that a quotient of the second VBI divided by the second SBBI is an integer; or if the quotient of the second VBI divided by the synchronization device beacon interval S-BI of the target small bandwidth cluster is not an integer, changing a value of the second VBI to a value of a third VBI so that a quotient of the third VBI divided by the S-BI is an integer, adjusting a corresponding first SBBI to be equal to the S-BI, and notifying the second device to adjust a corresponding second SBBI, so that a quotient of the third VBI divided by the second SBBI is an integer; and sending a beacon frame in the empty Beacon SP on the target small bandwidth channel, setting a corresponding Clustering Control field, and joining the target small bandwidth cluster as a cluster member; wherein the first device and the second device are synchronization pair devices, and the beacon frame is a directional multi-gigabit beacon frame in a 60GHz technology.