A communication system for an elevator system, a communication method for an elevator calling system, and a computer-readable storage medium for implementing the method. A communication system includes at least two communication node groups, each of the communication node groups comprising wireless modules deployed at a plurality of locations of the elevator system, one of the wireless modules in each of the communication node groups is set as the first node and the other wireless modules are set as the second node; a master node, which can be configured to establish a communication connection with one of the first nodes as designed, the first node in each of the communication node groups can be configured to establish a wireless communication connection with the second node belonging to the same communication node group and establish a wireless communication connection with the first node in the adjacent communication node group.