To provide an access control method and a database system for providing satisfactory convenience, and for securing satisfactory security in performing access to a database system.

The access authority level of a user and the secrity classification level of each data in a database using the database system 1 are preliminarily set in an access authority table 142 and a secrity classification table 143, and when a user performs access to the database 141, reading is approved when (access authority level of user)≥(secrity classification level of data), and writing is approved when (access authority of user)≤(secrity classification level of data).

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