A physiological information monitoring system for monitoring physiological information on a patient is provided. A first monitor has a first display and a first connector. A second portable monitor has a second display, a second connector, and a signal input unit. A measurement signal of physiological information is input to the signal input unit. The second display unit displays information corresponding to the measurement signal. When the first connector and the second connector are connected, the second display is brought into a non-display status, whereupon the first display displays information corresponding to the measurement signal.
