Abstract: A communication system has a transmission system and a reception system for receiving data and a transmitter-side operations message file from the transmission system. The transmission system has a transmitter-side data base, an inputting device for inputting an operation message signal for a data operation of registration, deletion or change to the transmitter-side data base, a controller for controlling transmitter-side data base processing that carries out the data operation based on the operation message signal, and a device for generating and transmitting an operation message file that receives the operation message signal from the operation message inputting device and then generates the transmitter-side operation message file to send it to the reception system.