A communication apparatus includes a memory and a processor. The processor is configured to perform operations including 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. In a case where a group ID stored in the memory is selected, transmitting names data items corresponding to the acquired device IDs and the acquired calculation data items corresponding to the acquired device IDs, in association with the group ID to a server, and receiving an integrated data item being obtained based on the names data items and the acquired calculation data items associated with the group ID.