a control component operable to instruct, when the medical images respectively displayed in a first image display region group of the reduced image display regions and a second image display region group of the observation display regions are designated using said operation component, to execute associated image processing of the image data of said designated medical images based on {HEAD ~ the combination} of the first image display region group and {TAIL ~ the second image display region group} and said associating information, wherein 
a control component operable to instruct , when the medical images respectively displayed in a first image display region group of the reduced image display regions and a second image display region group of the observation display regions are designated using said operation component , to execute associated image processing of the image data of said designated medical images based on { HEAD ~ the combination } of the first image display region group and { TAIL ~ the second image display region group } and said associating information , wherein
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