A method of forming a virtual endoscope image of a uterus is disclosed. The virtual image showing an inner wall of a uterus is formed from a three-dimensional ultrasound uterus image obtained by hysterosalpingography with a solution. An inner wall of the uterus in the 3D virtual image is inspected and a virtual endoscope image of the uterus is formed by reflecting the inspection result on the 3D virtual uterus image. Also, the virtual endoscope images in every aspect are provided according to the positions of a view point or virtual light source. Thus, the inner wall of the uterus can be inspected more easily.