The control part 2, when two medical images displayed on different image display regions of the image display regions P1 to P4 have each been designated using the operation component 10, instructs to execute, for at least one image data of said two medical images, the process indicated in the processing content associated with {HEAD ~ the combination} of the image display regions in which {TAIL ~ these two medical images} are displayed by the process associating information 32 a 
The control part 2 , when two medical images displayed on different image display regions of the image display regions P1 to P4 have each been designated using the operation component 10 , instructs to execute , for at least one image data of said two medical images , the process indicated in the processing content associated with { HEAD ~ the combination } of the image display regions in which { TAIL ~ these two medical images } are displayed by the process associating information 32 a
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