PURPOSE: To attain the asynchronous execution of a reception processing and a file update processing by separating the reception processing of a reception- side host and the file update processing by means of reception data and storing received update information into a temporary storage file in terms of logical data meanwhile.

CONSTITUTION: A transaction starting means 4 receives key information transmitted from a reception data input means 2, and gives key information to a file update means 5. It receives key information from the transaction starting means 4, receives reception data in inter-host communication, reads data from the reception data temporary storage file 3, logically and exclusive by controls a job processing file to be updated, updates the job processing file, deletes data from the temporary storage file 3, and a key information transmission processing which is necessary for the cancel of the processing when re-execution is required and for the starting of the transaction starting means 4 is executed.