Abstract: A communication device is provided in which, in case of a power failure caused by an earthquake, a slave unit can be used as an illumination device, which includes a high-visibility display portion, in which notification lamps to be lit or blinked can be selected by a user, and in which the color of an incoming lamp that is lit at the time of normal reception can be prevented from being similar to that at the time of reception of the earthquake early warning. When a predicted period up to the arrival of a primary shock is calculated, the lighting and extinguishing of backlights arranged behind a group of operation buttons is controlled, and any of digits from 0 to 9 is displayed on an input portion. The colors of the lit backlights are changed according to the value of a predicted seismic intensity, and the predicted period is displayed. The color of the incoming lamp lit when the earthquake early warning is received cannot be set at the color of the incoming lamp lit when normal reception is performed.

Abstract: A mobile telephone device has a location detector for detecting the location information of the mobile telephone device itself, a receiver for receiving the location information of the communication partner device, a direction sensor, and a direction calculator for calculating the direction of the communication partner device relative to the mobile telephone device based on the location information of the two devices. The direction of the communication partner device is displayed against a background coinciding with the bearing detected by the direction sensor. This configuration permits the location of a communication partner to be indicated in an easy-to-grasp way even with a small display. Moreover, the mobile telephone device indicates the location of a communication partner before responding to a call. This configuration permits a call receiver to decide whether to respond to a call or not after identifying the location of a call originator.