PROBLEM TO BE SOLVED: To display structure extracted from a plurality of images acquired in different imaging devices.SOLUTION: A projection image generation unit 12 generates a projection image projected on a surface vertical to a depth direction on the basis of a tomographic image acquired by an image acquisition unit 11. A patient data confirmation unit 13 searches a surface image or SLO image corresponding to the imaged tomographic image in a storage unit 30. An alignment unit 14 performs alignment between the tomographic image and the surface image or SLO image. An analysis unit 15 extracts structure of a blood vessel and the like from each of the tomographic image and the surface image or SLO image. A display image preparation unit 19 prepares image data for displaying an extraction result superimposing on an image of an eyeground. A display unit 40 displays the prepared image data.
