Disclosed is an ultrasound diagnostic method for an object having a tubular shape. The ultrasound diagnostic method includes acquiring ultrasound volume data of the object, generating a first ultrasound image which is obtained by imaging a surface of the object, based on the ultrasound volume data, generating a second ultrasound image which is obtained by imaging at least one selected from blood flow, stiffness, a thickness of a wall, and contrast agent augmentation of an inside of the object included in the first ultrasound image, based on the ultrasound volume data, and displaying the first ultrasound image and the second ultrasound image.