A communication apparatus comprising: a display; a memory; and a processor that is configured to perform operations transmitting, to a server, a request for generating a group; acquiring a screen for generating the group which is sent from the server in response to the transmitting the request; transmitting, to the server, a name of the group inputted by a user's input operation in the acquired screen; acquiring, from the server, a group ID automatically generated by the server corresponding to the inputted name of the group, and registering, in the memory, the acquired group ID and the inputted name of the group in association with each other; characterized in that the communication apparatus is further configured for; acquiring, from each of a plurality of calculation devices (10A, 10B), each device ID and each calculation data item of each calculation device by (a) imaging each two-dimensional code, in which each device ID and each calculation data item are encoded, displayed on the display of each calculation device, and (b) analyzing each imaged two-dimensional code to acquire each device ID and each calculation data item in association with each other; after the analyzed each device ID and each calculation data item being acquired, for each acquired device ID, in a case where the acquired device ID is not previously registered in the memory, registering a name inputted by a user's input operation in association with the acquired device ID; and after the analyzed each device ID and each calculation data item being acquired and after selecting by a user's selection operation any one of the registered name of the group from among at least one registered name of the group, transmitting, to the server, object data for integration including: (i) the acquired device ID and the acquired calculation data item in association with each other, (ii) the selected any one of the registered name of the group, and (iii) the registered name corresponding to the acquired device ID. a display; a memory; and a processor that is configured to perform operations transmitting, to a server, a request for generating a group; acquiring a screen for generating the group which is sent from the server in response to the transmitting the request; transmitting, to the server, a name of the group inputted by a user's input operation in the acquired screen; acquiring, from the server, a group ID automatically generated by the server corresponding to the inputted name of the group, and registering, in the memory, the acquired group ID and the inputted name of the group in association with each other; characterized in that the communication apparatus is further configured for; acquiring, from each of a plurality of calculation devices (10A, 10B), each device ID and each calculation data item of each calculation device by (a) imaging each two-dimensional code, in which each device ID and each calculation data item are encoded, displayed on the display of each calculation device, and (b) analyzing each imaged two-dimensional code to acquire each device ID and each calculation data item in association with each other; after the analyzed each device ID and each calculation data item being acquired, for each acquired device ID, in a case where the acquired device ID is not previously registered in the memory, registering a name inputted by a user's input operation in association with the acquired device ID; and after the analyzed each device ID and each calculation data item being acquired and after selecting by a user's selection operation any one of the registered name of the group from among at least one registered name of the group, transmitting, to the server, object data for integration including: (i) the acquired device ID and the acquired calculation data item in association with each other, (ii) the selected any one of the registered name of the group, and (iii) the registered name corresponding to the acquired device ID.