A portable telephone that includes a control unit, a memory unit, a wireless
communication
function unit, an imaging unit, a display unit, an operation unit, a voice input
unit, a voice output unit, a battery and a power supply unit. The control unit
controls the battery capacity level of the portable telephone, and information
regarding the battery capacity is attached to a transmission image and the composite
information is transmitted to the call destination. An alarm image stored in the
memory is automatically transmitted when a battery capacity decrease alarm occurs.
Therefore, the call destination is always capable of knowing the battery capacity
of the sending portable telephone and the present invention can prevent the unintentional
line disconnection.