1. A medical image processing device which creates a display image formed by the pixels of plural cross-sectional images, to be displayed on a display device for radiographic image interpretation of interosseous tissue or bone tissue, comprising: a conversion image creation unit configured to create a conversion image including the interosseous tissue and plural bone tissues having the interosseous tissue therebetween, on the basis of the plural cross-sectional images; a feature point specification unit configured to execute a process, for each conversion image, of specifying at least two points as feature points by a predetermined specifying condition using at least two conversion images having different conversion curved surfaces showing the position of the pixels that constitute the conversion image; a display image creation unit configured to calculate a reference curved surface for creating the display image on the basis of the feature points and to create the display image on the basis of the reference curved surface; and a display unit configured to display the display image on the display device.