The present invention enables to select necessary metadata from presumed metadata candidates that are more likely to be added and to easily select metadata desired by a user, thereby reducing working load on a user largely, and facilitating the operation of adding shooting scene information even to a large amount of shot data recorded in a large-capacity recording medium. A processing process of detecting metadata associated with second contents data from the second contents data which is in a same category as first contents data, and a processing process of selectably outputting candidates of non-time information metadata to be stored, associated with the first contents data, in a storing section, based on time information metadata and non-time information metadata associated with the second contents data and time information metadata associated with the first contents data which is to be added metadata, are performed.