A system includes an access management server and a cooperation server, wherein the access management server comprises issuance unit that issues a token corresponding to the managed user account in response to a request of the cooperation server, and deletion unit that deletes a user account, of the managed user accounts, which satisfies a predefined deletion condition, and the cooperation server comprises acquisition unit that acquires, when acquisition of a token corresponding to the user account managed by the access management server is requested by another server, if the deletion unit has not deleted the user account, an issued token corresponding to the user account, and to cause, if the deletion unit has already deleted the user account, the access management server to re-register the user account to acquire a token issued for the re-registered user account.