a server apparatus includes a processor . the processor is configured to perform : calculation target data receiving processing , group id receiving processing , data registering processing and integrated calculation result transmitting processing . the calculation target data receiving processing receives calculation target data which is to be output from an information display device . the group id receiving processing receives a group id . the data registering processing registers the calculation target data received in the calculation target data receiving processing in association with the group id received in the group id receiving processing . the integrated calculation result transmitting processing integrates each calculation target data registered in association with the group id in the data registering processing for each group id and transmits a calculating result based on the integrated data .