A status monitoring system includes multiple sensors that detect a status of a monitoring target, a transmission unit that transmits changed detection data when detection data detected by the multiple sensors changes, a storage unit that stores the detection data transmitted by the transmission unit, a prediction unit that predicts, from past detection data stored in the storage unit, a time at which the detection data detected by the multiple sensors is predicted to change, and an instruction unit that instructs a specific subset of the multiple sensors to transmit data for checking operation a preset amount of time before the time predicted by the prediction unit.