A method of monitoring vascular health condition, the method comprising: based on a request for monitoring vascular health, providing (510, 611) information on a first contact state to a user to guide the user to touch a pulse wave sensor with an object with a contact pressure of a first contact pressure; obtaining (520, 613), by the pulse wave sensor, a first pulse wave signal during a first interval in the first contact state of the object at the first contact pressure between the object and the pulse wave sensor; providing (530, 614) information on a second contact state to the user to guide the user to increase the contact pressure to a second pressure or higher, and upon satisfaction of a condition, to decrease the contact pressure to the first pressure; obtaining (540, 618) a second pulse wave signal during a second interval following the first interval in the second contact state of the object, wherein said second interval comprises a first period of time in which blood vessels are occluded in the object in response to a second contact pressure being increased with respect to the first contact pressure, and a second period of time in which collected blood is released in the object by again decreasing the contact pressure from the second contact pressure to the first contact pressure, and wherein a determination that the blood vessels are occluded in the object is performed by determining whether the AC component is detected during the first period of time of the second interval; estimating (560, 620) a degree of vasodilation based on an alternating current, AC, component of each of the first pulse wave signal and the second pulse wave signal, wherein the estimating (560, 620) the degree of vasodilation comprises correcting an area of a first AC component based on a difference between a contact pressure of the object at a time of obtaining the first pulse wave signal and a first pressure corresponding to the first contact state, and correcting an area of a second AC component based on a difference between the contact pressure of the object at a time of obtaining the second pulse wave signal and a second pressure corresponding to the second contact state; and wherein the estimating (560, 620) the degree of vasodilation further comprises estimating a first blood volume based on the area of the first AC component detected from the first pulse wave signal, estimating a second blood volume based on the area of the second AC component detected from the second pulse wave signal, and estimating the degree of vasodilation based on a difference between the first blood volume and the second blood volume; monitoring (570, 621) the vascular health condition based on the estimated degree of vasodilation; and outputting a result of monitoring the vascular health condition. based on a request for monitoring vascular health, providing (510, 611) information on a first contact state to a user to guide the user to touch a pulse wave sensor with an object with a contact pressure of a first contact pressure; obtaining (520, 613), by the pulse wave sensor, a first pulse wave signal during a first interval in the first contact state of the object at the first contact pressure between the object and the pulse wave sensor; providing (530, 614) information on a second contact state to the user to guide the user to increase the contact pressure to a second pressure or higher, and upon satisfaction of a condition, to decrease the contact pressure to the first pressure; obtaining (540, 618) a second pulse wave signal during a second interval following the first interval in the second contact state of the object, wherein said second interval comprises a first period of time in which blood vessels are occluded in the object in response to a second contact pressure being increased with respect to the first contact pressure, and a second period of time in which collected blood is released in the object by again decreasing the contact pressure from the second contact pressure to the first contact pressure, and wherein a determination that the blood vessels are occluded in the object is performed by determining whether the AC component is detected during the first period of time of the second interval; estimating (560, 620) a degree of vasodilation based on an alternating current, AC, component of each of the first pulse wave signal and the second pulse wave signal, wherein the estimating (560, 620) the degree of vasodilation comprises correcting an area of a first AC component based on a difference between a contact pressure of the object at a time of obtaining the first pulse wave signal and a first pressure corresponding to the first contact state, and correcting an area of a second AC component based on a difference between the contact pressure of the object at a time of obtaining the second pulse wave signal and a second pressure corresponding to the second contact state; and wherein the estimating (560, 620) the degree of vasodilation further comprises estimating a first blood volume based on the area of the first AC component detected from the first pulse wave signal, estimating a second blood volume based on the area of the second AC component detected from the second pulse wave signal, and estimating the degree of vasodilation based on a difference between the first blood volume and the second blood volume; monitoring (570, 621) the vascular health condition based on the estimated degree of vasodilation; and outputting a result of monitoring the vascular health condition.