| 摘要 |
A security system ensures the security of electronic information shared among a plurality of companies by restricting the accessible range of the electronic information depending on the managing level of a user who accesses the electronic information. When a requester makes a request for sharing electronic information, the system acquires the managing level of the requester from user data, finds a tenant to which the requester belongs from tenant data, and provides the requester with a list of users who belong to the tenant to which the requester belongs.
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