1. A computer readable information storage medium read and executed by a medium layer, comprising: audio/video (AV) data providing a video picture when read and executed; and multiple markup documents information which represents text information in multiple languages to be displayed in one of the multiple languages and defines a display window to display the video picture corresponding to an AV data stream decoded and reproduced from the AV data when being read and executed; and multi-language markup document information representing a markup document to display the text information in the one of the multiple languages when being read and executed.