Included are calling means (110) for making a call to a communication terminal (200) possessed by a target person, a database (120) configured to store in advance speech data of the target person, comparison means (130) for comparing a tone of speech data transmitted from the communication terminal with a tone of the speech data stored in the database (120), and notification means (140) for issuing a predetermined notification when a difference between the tone of the speech data transmitted from the communication terminal (200) and the tone of the speech data stored in the database (120) is determined to be outside a predetermined range as a result of the comparison by the comparison means (130). With this configuration, it is possible to obtain correct information about a condition of the target person.