Abstract: A numerical operation system for a plurality of individuals includes a contactless communication tag each included in a plurality of individuals, a reader allowed to read the contactless communication tag, and a control unit to which a result read by the reader is input, wherein the control unit is configured such as to acquire, from the result read by the reader, at least numerical values each corresponding to the plurality of individuals and operator symbols for operating the numerical values to calculate a total value based on the numerical values and the operator symbols.

Abstract: An authentication method includes a first step and a second step. The first step causes a voice including a predetermined character string to be output from a speaker 23. The second step acquires voice information by receiving an utterance voice of the target user via a microphone 21 after the first step, and determines from the voice information whether the target user is the specific user or not. In the second step, it is determined whether a character string recognized from the voice information is matched to the predetermined character string. In the second step, it is determined whether characteristics of the utterance voice of the target user is matched to characteristics of the voice of the target user based on a characteristics amount recognized from the voice information and a characteristics amount of voice information registered in advance as the voice of the specific user.

Abstract: A numerical operation system for a plurality of individuals includes a contactless communication tag each included in a plurality of individuals, a reader allowed to read the contactless communication tag, and a control unit to which a result read by the reader is input, wherein the control unit is configured such as to acquire, from the result read by the reader, at least numerical values each corresponding to the plurality of individuals and operator symbols for operating the numerical values to calculate a total value based on the numerical values and the operator symbols.