Provided is a frailty diagnosis method including: setting, by a processor, a setting value for measuring a walking speed according to positions of at least two measuring devices； detecting, by the at least two measuring devices, a movement of a frailty diagnosis-target person； measuring, by the processor, a walking speed of the frailty diagnosis-target person based on the movement of the frailty diagnosis-target person according to the setting value； and determining, by the processor, a frailty index of the frailty diagnosis-target person based on the measured walking speed.
