In a process for a wireless network device in a first Neighbor Awareness Network device cluster (NAN cluster) to join a second NAN cluster, the wireless network device first discovers the second NAN cluster by means of scanning for networking signals from the second NAN cluster. If it determines, based on the attribute information of the second NAN cluster, to join the second NAN cluster, the wireless network device sends an event message to other wireless network devices in the first NAN cluster. The event message also contains a cluster ID (CID) of the second NAN cluster. The wireless network device joins the second NAN cluster, wherein the step of joining comprises: performing service discovery in the second NAN cluster instead of performing service discovery in the first NAN cluster.