A contact destination using terminal 7 is a terminal used by a user registered by a called party as a contact destination, such as a relative of the called party. The anti-communications fraud apparatus 1 notifies the contact destination using terminal 7 that there is a suspicious call. A public institution 8 such as a police station provides information on voices of malicious persons who are involved in communications fraud to the anti-communications fraud apparatus 1.

FIG. 2 is a block diagram illustrating a configuration of the anti-communications fraud apparatus 1. The anti-communications fraud apparatus 1 includes a registration unit 11, a voice acquisition unit 12, an analysis unit 13, a determination unit 14, a notification unit 15, an updating unit 16, a voiceprint DB 17, and a contact destination DB 18.

The registration unit 11 registers a voiceprint and a degree of fraud risk (score) of the voiceprint in association with each other in the voiceprint DB 17. Specifically, the registration unit 11 acquires voices of suspicious persons, malicious persons involved in communications fraud, and registers a voiceprint of each voice and a degree of fraud risk corresponding to the voiceprint in the voiceprint DB 17, the voices being provided from the public institution 8 such as a police station or public security. The registration unit 11 transmits the voice to the analysis unit 13, and acquires, from the analysis unit 13, a voiceprint of the voice as an analysis result.