A communication system includes a first node, a second node, and a third node, and one of these nodes acts as a coordinating node. The coordinating node obtains first information that includes information regarding a candidate beam for the first node and information regarding a candidate beam for the second node. The coordinating node determines beam information of the first node and beam information of the second node based on the first information, where the beam information of the first node indicates a transmit beam for the first node, and the beam information of the second node indicates a receive beam for the second node.