PURPOSE: To exclusively control the data on a newly connected recording medium by generating management objects on the recording medium in corresponding to the data one to one and limiting the method for performing access to the data to the one which is performed through the management objects.

CONSTITUTION: Management objects corresponding to the data on a newly connected CD-ROM 10 one to one are generated on a magnetic disk 11. Then the method of performing access to the data on the CD-ROM 10 is limited so that the access can only be made through the management objects on the disk 11. By generating the management objects to each data on a newly connected storing medium prior to the execution of an exclusive controlling process and limiting the route for performing access to each data in such way, exclusive control is performed on a newly connected physical medium by means of the exclusive controlling process of the system.