A sensor output data acquisition unit (42) of an image data generation unit (30) in an image processing device (20) acquires layered image information data from a sensor group (12). A slice image generation unit (44) generates two-dimensional image data for each slice plane for which a distribution has been acquired. An image axis transformation unit (50) generates the same type of two-dimensional image data for multiple planes perpendicular to an axis different from a sensor axis. In accordance with properties such as viewing position, a slice image management unit (52) of a display process unit (32) manages slice images to be used for drawing. A drawing memory unit (56) successively stores the image data needed for drawing. An additional object image storage unit (58) stores image data for an object to be additionally displayed, such as a cursor. An image drawing unit (54) draws a three-dimensional object using the data for the slice images.
