A logical unit number management device includes: an access processing unit that performs information processing with access objects by using logical unit numbers for identifying logical identification information; a logical unit number management table storage unit that stores a logical unit number management table storing a corresponding relationship between the logical identification information and the logical unit numbers; a logical unit number management table changing unit that changes the corresponding relationship based on an external change request; a change completion reporting unit that reports change completion to the access processing unit when the logical unit number management table has been changed in accordance with the change request; and an access control unit that controls an access to the access object indicated by the logical identification information corresponding to one of the logical unit numbers after a report of the change completion.