When feedback information is received from the called terminal 6 or the contact destination using terminal 7, the anti-communications fraud apparatus 1 updates the degree of fraud risk of the voiceprint of the calling party in the voiceprint DB 17 according to the feedback information (S18).

The anti-communications fraud apparatus according to the present embodiment described above includes: the analysis unit 13 that analyzes a voiceprint of a communication voice of a calling party; the determination unit 14 that acquires, from the voiceprint DB 17 that stores a voiceprint and a degree of fraud risk are stored in association with each other, the degree of fraud risk corresponding to the voiceprint of the calling party, and determines whether the degree of fraud risk exceeds a predetermined threshold; and the notification unit 15 that notifies that the calling party is dangerous when the degree of fraud risk exceeds the threshold.

As described above, in the present embodiment, a communication voice (voiceprint) that is biological information hard to disguise or change is used to determine a suspicious person or a malicious person, and a notification about the suspicious person or the malicious person is sent to a called party, a relative of the called party, or the like. As a result, even if a malicious calling party frequently changes his/her phone number, it is possible to identify the calling party and send the notification to the called party or the like in the present embodiment.