This policy conflict detection system enables a policy conflict to be resolved by having a determination unit for determining, in response to an instruction regarding application of a second policy which is sent from a second network provider to a first network provider carrying out policy control on the basis of a set of first policies, whether or not a third policy which matches the second policy in priority level, applicable period, control object, and control condition but has a control content incompatible with that of the second policy, is present among the first policies.
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