A communication apparatus and an air-cooling method for the same utilizes an air-cooling mode that can be easily changed to reduce the cost to increase the number of transceiver units and space for the housing. The communication apparatus includes transceiver units installed in a housing and attachable onto and detachable from the communication apparatus and fan units for forcibly air-cooling heat generated from the transceiver units. The fan units are installed in the housing and are attachable onto and detachable from the communication apparatus. Each transceiver unit includes a transceiver function section; a forced air-cooling radiator fixedly mounted in the transceiver function section for forcibly air-cooling heat generated from the transceiver function section; and a natural air-cooling radiator mounted in the transceiver function section for naturally air-cooling heat generated from the transceiver function section. The natural air-cooling radiator is attachable onto and detachable from the main transceiver section.