A patient monitoring system is provided. A sensor is attached to a subject. A processor acquires physiological information of the subject, and detects an occurrence of an event. A communication interface is wirelessly communicable with a remote device through a communication network. When the processor detects an occurrence of the event, a power supplying member supplies a first electric power that is necessary for transmission of physiological information to the remote device, to the communication interface. When an occurrence of the event is not detected, the power supplying member supplies a second electric power that is lower than the first electric power, to the communication interface.
