28. The method according to claim 27 , wherein the format of the file comprises one or more types selected from a group consisting of a text format, an image format, an audio format, a video format and an attachment format.
28. The method according to claim 27 , wherein the format of the file comprises one or more types selected from a group consisting of a text format, an image format, an audio format, a video format and an attachment format. 32. The method according to claim 28 , wherein for the non-SMIL files of different file formats, their respective file bodies are of list structures; all the non-SMIL file lists of different file formats are combined into a non-SMIL file sequence.