A moving picture suitable for display on a mobile telephone is displayed comparatively quickly. When a moving picture is requested, a leading segment of the moving picture is converted. The leading segment has an amount of data which, after the conversion, is less than the amount of data that is displayable on the mobile telephone that issued the request. A succeeding segment, which can be converted while the leading segment is being transmitted to the mobile telephone and viewed by the user of the mobile telephone, is converted. If there is a request for the succeeding segment after the leading segment is viewed, the conversion of the succeeding segment will be finished by the time of the request for succeeding segment. As a result, the succeeding segment can be transmitted to the mobile telephone quickly, and it can be viewed rapidly.