In a content management system, a still image generation unit generates at least one piece of still image data based on moving image data. A still image selection unit causes a user to select one piece of still image data from among the generated at least one piece of still image data. A management marker registration unit registers the selected still image data or information based on the selected still image data as a management marker in association with the moving image data. An access key issuing unit issues an access key for accessing the moving image data. And a management image generation unit generates management image data including the still image data and the access key.