In a content management system, the still image extracting unit extracts a plurality of frames of still image data from the moving image data based on the motion of the person of interest. The scene determining unit determines a scene of the moving image including a still image corresponding to each of the plurality of frames of the still image data. The management marker registration unit registers, as a management marker, each of the plurality of frames of still image data or an image feature amount of each still image in association with a scene of a moving image corresponding to each still image. The management image generator generates management image data including at least two pieces of the still image data.