A communication apparatus includes a memory and a processor. The processor is configured to perform operations including: storing group IDs; acquiring device IDs and calculation data items from a plurality of calculation devices, respectively, each device ID and each calculation data item being in association with each other; registering names in association with the acquired device IDs; and transmitting (i) the registered names corresponding to the acquired device IDs, in association with the stored group IDs, to a server and (ii) the calculation data items corresponding to the acquired device IDs, in association with the stored group IDs, to a server.