A method for previewing application subject content on a mobile terminal with a Java AMS interface where Java applications are listed as icons, characterized by comprising: in response to a user moving a focus, triggering and generating (101, 201) a highlight application request by obtaining the Java application selected on the user interface and retention time of the highlight application request, so as to achieve highlight effect and enable terminal users to clearly know the Java application that obtains the focus, wherein the retention time is the time length that the focus is obtained by the currently selected Java application continuously; obtaining corresponding file content according to the highlight application request if the retention time is greater than or equal to a preset threshold by: obtaining attribute information corresponding to the highlight application request; obtaining a path corresponding to the file content according to the attribute information; and extracting the file content corresponding to the highlight application request according to the path; and previewing the file content, wherein the previewing the file content comprises: if the file content is a graphics file, displaying the graphics file on a display interface in a dynamic mode in full screen; if the file content is a video file, playing the video file on the display interface in full screen; and if the file content is an audio file, playing the audio file by using a loudspeaker. in response to a user moving a focus, triggering and generating (101, 201) a highlight application request by obtaining the Java application selected on the user interface and retention time of the highlight application request, so as to achieve highlight effect and enable terminal users to clearly know the Java application that obtains the focus, wherein the retention time is the time length that the focus is obtained by the currently selected Java application continuously; obtaining corresponding file content according to the highlight application request if the retention time is greater than or equal to a preset threshold by: obtaining attribute information corresponding to the highlight application request; obtaining a path corresponding to the file content according to the attribute information; and extracting the file content corresponding to the highlight application request according to the path; and obtaining attribute information corresponding to the highlight application request; obtaining a path corresponding to the file content according to the attribute information; and extracting the file content corresponding to the highlight application request according to the path; and previewing the file content, wherein the previewing the file content comprises: if the file content is a graphics file, displaying the graphics file on a display interface in a dynamic mode in full screen; if the file content is a video file, playing the video file on the display interface in full screen; and if the file content is an audio file, playing the audio file by using a loudspeaker. if the file content is a graphics file, displaying the graphics file on a display interface in a dynamic mode in full screen; if the file content is a video file, playing the video file on the display interface in full screen; and if the file content is an audio file, playing the audio file by using a loudspeaker.