A medical monitoring system includes: a plurality of biological information displaying devices connected to a network； and a portable terminal which can wirelessly communicate with the biological information displaying devices. The plurality of biological information displaying devices includes a first device and a second device. When a value of biological information is larger or smaller than a preset threshold, the first device transmits alarm information. In case where the first device transmits the alarm information, a receiving unit of the portable terminal receives the alarm information, and a transmitting unit of the portable terminal wirelessly transmits the received alarm information to the second device, and the second device receives the biological information through the network and the biological information is displayed on the second device.
