Abstract: In order to more accurately ascertain the number of evacuees, a calculation device according to the present invention comprises: a communication means which transmits a response request to terminals in an evacuation shelter and which receives, from the terminals that have responded to the response request, signals in accordance with operations by users of the terminals; and a calculation means which calculates, as the number of evacuees in the evacuation shelter, the number of the terminals which have transmitted the signals.

Abstract: To provide a communication terminal that improves convenience of a user who uses a communication terminal adapted to a plurality of communication schemes. A communication terminal (1) includes a first communication unit (2) configured to perform communication according to a first communication scheme, a second communication unit (3) configured to perform communication according to a second communication scheme, and a control unit (4) configured to, when a first period in which the first communication unit (2) performs discontinuous reception and a second period in which the second communication unit (3) performs the discontinuous reception overlap, transition the first communication unit (2) to a sleep state in a third period in which the first period and the second period overlap.