Notification system, notification method, and non-transitory computer readable medium storing program

A notification method comprising:

• making a call to a communication terminal possessed by a target person;
• comparing a tone of speech data transmitted from the communication terminal with a tone of the speech data stored in a database which stores speech data of the target person in advance;
• issuing a predetermined notification when a difference between the tone of the speech data transmitted from the communication terminal and the tone of the speech data stored in the database is determined to be outside a predetermined range as a result of the comparison;
• and
• learning the speech data in a call to the communication terminal possessed by the target person and updating the speech data stored in the database by reflecting the learned result in the database.

A non-transitory computer readable medium storing a program, when executed by a processor, causes a computer to:

• make a call to a communication terminal possessed by a target person;
• compare a tone of speech data transmitted from the communication terminal with a tone of the speech data stored in a database which stores speech data of the target person in advance;
• issue a predetermined notification when a difference between the tone of the speech data transmitted from the communication terminal and the tone of the speech data stored in the database is determined to be outside a predetermined range as a result of the comparison;
• and
• learn the speech data in a call to the communication terminal possessed by the target person and updating the speech data stored in the database by reflecting the learned result in the database.