A file producing method for producing an MP4 file from an elementary stream, the method comprising: acquiring (S41) a play list for export including identification information indicating each of a plurality of elementary streams including a first elementary stream and a second elementary stream, wherein the play list for export includes (i) a first identification information indicating the first elementary stream and a second identification information indicating the second elementary stream as predetermined identification information; and (ii) first section information indicating a first section of the first elementary stream and second section information indicating a second section of the second elementary stream as section information; acquiring (S43) a manifest file specifying the first section of the first elementary stream and the second section of the second elementary stream indicated by the section information of the play list for export; selecting (S42) elementary streams indicated by the predetermined identification information; producing (S43) the MP4 file by converting data including the first section of the selected first elementary stream and the second section of the selected second elementary stream into an MP4 file format based on the manifest file, which is correlated with the selected elementary streams, the manifest file being necessary for the conversion of a file format based on a predetermined rule. acquiring (S41) a play list for export including identification information indicating each of a plurality of elementary streams including a first elementary stream and a second elementary stream, wherein the play list for export includes (i) a first identification information indicating the first elementary stream and a second identification information indicating the second elementary stream as predetermined identification information; and (ii) first section information indicating a first section of the first elementary stream and second section information indicating a second section of the second elementary stream as section information; (i) a first identification information indicating the first elementary stream and a second identification information indicating the second elementary stream as predetermined identification information; and (ii) first section information indicating a first section of the first elementary stream and second section information indicating a second section of the second elementary stream as section information; acquiring (S43) a manifest file specifying the first section of the first elementary stream and the second section of the second elementary stream indicated by the section information of the play list for export; selecting (S42) elementary streams indicated by the predetermined identification information; producing (S43) the MP4 file by converting data including the first section of the selected first elementary stream and the second section of the selected second elementary stream into an MP4 file format based on the manifest file, which is correlated with the selected elementary streams, the manifest file being necessary for the conversion of a file format based on a predetermined rule. <EOS>