A vascular state measurement method comprising: emitting a first emission electromagnetic signal to a first measurement position of a target vessel, and emitting a second emission electromagnetic signal to a second measurement position of the target vessel; receiving a first feedback electromagnetic signal induced by the first emission electromagnetic signal from the first measurement position, and receiving a second feedback electromagnetic signal induced by the second emission electromagnetic signal from the second measurement position; calculating a difference of signal characteristics between the first feedback electromagnetic signal and the second feedback electromagnetic signal; and calculating at least one vascular state of the target vessel based on the difference of signal characteristics. |