To provide a communication system in which a notification about first output data is not made at a predetermined timing after the first output data is generated if a print product based on the first output data and a print product based on second output data are not output at the predetermined timing and a time when the second output data is edited last is later than a time when the first output data is edited last and the notification about the first output data is made at the predetermined timing if the print product based on the first output data and the print product based on the second output data are not output at the predetermined timing and the time when the second output data is edited last is earlier than the time when the first output data is edited last.