To minimize a time for communication and a cost for communication in an electrical thermos for life monitor obtained by making it possible to connect at least two electrical thermos so as to transmit or receive information mutually through a prescribed communication means.

It is possible to connect at least two electrical thermos which are provided with the transmission or reception circuits of using information and used individually between separated places so as to transmit or receive information mutually through the prescribed communication means at need. When information showing using of the electrical thermos on an opposite side is not obtained after the lapse of a prescribed time set in advance, prescribed caution information is displayed. In such an electrical thermos for life monitor, the lapse of the prescribed time is measured and decided on the side of the electrical thermos displaying the caution information corresponding to the deciding result to reduce the extra time for communication which is required conventionally for forming data for displaying the caution information and transmitting it to the electrical thermos on the side of a monitor.