An ultrasound diagnosis apparatus includes: an ultrasound probe； a display； an image processor； and a memory storing instructions that, when executed by the image processor, perform operations. The operations includes acquiring ultrasound data about an object； generating an ultrasound image, based on the acquired ultrasound data； generating a first marker for a first object of interest (OOI) which is not included in the generated ultrasound image； displaying the generated ultrasound image and a map image representing a viewing point corresponding to the ultrasound image, a viewing direction, a region that a virtual ray reaches, and a position of the first OOI； and marking the first marker to correspond to the position of the first OOI on the ultrasound image and the map image.
