A communication system includes transmitters and a receiver. The receiver includes a template extractor configured to extract a template consisting of a common portion and a variable portion of transmission data received from the transmitters on the basis of transmitter identification information included in the transmission data and content of the transmission data and a template transmitter configured to transmit the extracted template to the transmitters. The transmitters each include a transmission unit that compresses the transmission data using the template and transmits the compressed transmission data to the receiver.