To suitably control a data transmission control system by properly suppressing transmission of stored program data to economically use a limited transmission band when a transmission data capacity of real time program data is increased if the stored program data and the real time program data are broadcast in a digital broadcast.

The data transmission control system is provided with a program data conversion means 2 that converts stored program data and real time program data into data with a prescribed format and with a transmission control means 3 that applies transmission control to the stored program data and the real time program data. The transmission control means 3 detects an identification code to generate a transmission control parameter to suppress the transmission of the stored program data.