PURPOSE: To prevent the damage due to a breach of contrast and also to improve the maintenance of the onerous software by outputting a warning message before expiration of a term and also a stop message for a fixed period of time even after the expiration of the term and transmitting these messages to both a user and a maker.

CONSTITUTION: An onerous software offerer (maker) 2 totalize automatically and periodically the contents of a maintenance control file of an onerous software receiver (user) 1 via a public circuit 3, a floppy disk 3, an MT 5, etc. Based on this totalized information, the forfeit is requested by the circuit 3 after the expiration of a term and at the same time the maintenance control is carried out by the man power 4 for sales of new software, the guidance of expiration of a term, etc. While a message, the date of application, the frequency of application, the application period of time of a computer, etc. In such constitution, the damage due to the foul application and the automatic maintenance are ensured for the onerous software.