Abstract: To provide a communication device, a communication system, and a communication method that can easily make contact, the communication device comprises: a receiving unit configured to receive communication information including identification information on a destination user from a first terminal; at least one processor configured to execute an instructions to select, on the basis of the identification information, one among a first network to which a first communication module associated with the user can be connected and a second network to which a second communication module associated with the user can be connected and which is different from the first network; and a unit configured to transmit, via the network selected by the at least one processor, information related to the communication information to the communication module that can be connected to the selected network, among the first communication module and the second communication module.

Abstract: It is intended to provide a communication terminal capable of preventing an operator of the communication terminal from recognizing processing running in the communication terminal. A communication terminal (10) according to the present disclosure includes a communication unit (11) that transmits an emergency message and a control unit (12) that disables a user's operation of the communication terminal or a function executed by a user's operation of the communication terminal after the emergency message is transmitted, and the communication unit (11) starts data communication with a monitoring terminal and transmits data to the monitoring terminal while the function is disabled.