To eliminate a risk of deteriorating safety of each safe box even in the replacement of an electronic lock 30.

An operation terminal 10 for issuing an electronic key 20, and a spare electronic key 42 for the replacement of the electronic lock 30 are provided. When the number of the safe box is written with the operation terminal 10, the spare electronic key 42 is set in the electronic lock 30 after the replacement, so that the safe box number is read in the electronic lock 30. An identification code for combining the safe box number and a lock number together is read out from the electronic lock 30 and written in the operation terminal 10, so that the identification code in the operation terminal 10 is updated.