The total imaging time period and recorded volume of each image is displayed in association with the imaging date and time of the image. An imaging information acquiring section acquires information on the imaging dates and times and recorded volumes of images. The acquired information is held in an index table. A period setting part sets the period of a period display. An imaging start position deciding section decides the position corresponding to the imaging start date and time of each image in the period display. An imaging time length deciding section decides the display range of the imaging time length of each image in the period display. A recorded volume length deciding section decides the display range of the recorded volume length of each image. Based on these decision results, an imaging position display creating section creates an imaging position display in which the imaging start positions of the images and the imaging time lengths or the recorded volumes of the images are displayed relative to the period display.