A capsule medical device (100) includes a first imaging unit (101A) and a second imaging unit (101B). A processing unit (102) of the capsule medical device (100) adds a camera ID for identifying the imaging unit that has generated image data to the image data. A display device (150) which has received the image data displays a list of the image data on overview screens (10A, 10B) for the respective camera IDs. The observer selects a view switching button (12A/12B) on the overview screen (10A/10B) through an input unit (156), so that the overview screen to be displayed on a display unit (155) is switched to the overview screen (10B/10A).
