8. A subtitle display device, comprising: a receiver configured to receive a subtitle file; a processor coupled to a memory and configured to: parse a category label of the subtitle file obtain a category label of the subtitle file by means of parsing the subtitle file received by the receiver, wherein the category label comprises category content; present, on the subtitle display device in an interactive graphic manner, the category content obtained by parsing, for a user to perform selection; and a display coupled to the processor and configured to: receive a result of selecting one or more pieces of the category content by the user to form a selected category content; and display, according to the result of selecting, subtitles for which an attribute value of a category attribute is the selected category content, wherein for each subtitle line of the subtitles, the display is configured to: determine whether the category attribute exists in each subtitle line; determine whether the attribute value of the category attribute is the category content selected by the user when the category attribute exists in each subtitle line; and display each subtitle line for which the attribute value of the category attribute is the selected category content when the attribute value of the category attribute is the category content selected by the user.
8. A subtitle display device, comprising: a receiver configured to receive a subtitle file; a processor coupled to a memory and configured to: parse a category label of the subtitle file obtain a category label of the subtitle file by means of parsing the subtitle file received by the receiver, wherein the category label comprises category content; present, on the subtitle display device in an interactive graphic manner, the category content obtained by parsing, for a user to perform selection; and a display coupled to the processor and configured to: receive a result of selecting one or more pieces of the category content by the user to form a selected category content; and display, according to the result of selecting, subtitles for which an attribute value of a category attribute is the selected category content, wherein for each subtitle line of the subtitles, the display is configured to: determine whether the category attribute exists in each subtitle line; determine whether the attribute value of the category attribute is the category content selected by the user when the category attribute exists in each subtitle line; and display each subtitle line for which the attribute value of the category attribute is the selected category content when the attribute value of the category attribute is the category content selected by the user. 11. The subtitle display device according to claim 8 , wherein for Timed Text Markup Language (TTML) subtitles, the category label parsed by the processor is a nesting label, and the nesting label comprises a level 1 label and a level 2 label; and the level 1 label comprises a multiselect multiple attribute, and the level 2 label comprises the category content, wherein the processor is further configured to: select by default multiple pieces of the category content when the multiple is true and when the category content is presented on the subtitle display device; and select by default one piece of the category content when the multiple is false and when the category content is presented on the subtitle display device.