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 {HEAD ~ said designated medical images} based on {TAIL ~ the combination} of the first image display region group and the second image display region group and said associating information, wherein 
based on
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 { HEAD ~ said designated medical images } based on { TAIL ~ the combination } of the first image display region group and the second image display region group and said associating information , wherein
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