For example, in the above-described embodiment, a case where a calling party is a malicious person is described. However, there are also communications frauds that cause users to call back. In order to take a countermeasure for such a communications fraud, the anti-communications fraud apparatus 1 performs voiceprint analysis on a communication voice of a called party. That is, the analysis unit 13 analyzes a voiceprint of the communication voice of the called party, the determination unit 14 acquires a degree of fraud risk corresponding to the voiceprint of the called party from the voiceprint DB 17 and determines whether the degree of fraud risk exceeds a threshold, and when the degree of fraud risk exceeds the threshold, the notification unit 15 notifies at least one of a calling terminal of the calling party or a contact destination using terminal of the calling party that the called party is dangerous.

In addition, it is possible to detect a communications fraud by combining a technique of registering a phone number in a blacklist and detecting a malicious person on a control plane (C-plane) and a technique of using a voice by the anti-communications fraud apparatus 1 according to the above-described embodiment.