A method for browsing media content and executing functions related to the media content by a browser device, comprising: displaying a collage image (500, 600, 700) generated by arranging in image element regions of the collage image, a plurality of image elements, each of which corresponds respectively to one of a plurality of media contents; generating, from the collage image, a metadata file including a label map, wherein each pixel belonging to the collage image has one label, the label being a gray level, and each gray level corresponding to one image element, wherein the metadata file further includes identification information about a text element related to each image element; if a selection input is generated on the collage image, obtaining at least one element of an image element and a text element corresponding to a pixel location where the selection input is generated, wherein the at least one element corresponds to a specific media content among the plurality of media contents; and displaying a preview window for the specific media content using the at least one element, the preview window being overlaid on the collage image, wherein the text element includes information about the specific media content, and wherein the obtaining at least one element comprises: sensing whether there is the selection input generated on the collage image; determining location coordinates corresponding to the pixel location where the selection input is generated; determining a gray level at the location coordinates from the label map; and obtaining the at least one element of the image element and the text element corresponding to one of the plurality of media contents corresponding to the gray level. displaying a collage image (500, 600, 700) generated by arranging in image element regions of the collage image, a plurality of image elements, each of which corresponds respectively to one of a plurality of media contents; generating, from the collage image, a metadata file including a label map, wherein each pixel belonging to the collage image has one label, the label being a gray level, and each gray level corresponding to one image element, wherein the metadata file further includes identification information about a text element related to each image element; if a selection input is generated on the collage image, obtaining at least one element of an image element and a text element corresponding to a pixel location where the selection input is generated, wherein the at least one element corresponds to a specific media content among the plurality of media contents; and displaying a preview window for the specific media content using the at least one element, the preview window being overlaid on the collage image, wherein the text element includes information about the specific media content, and wherein the obtaining at least one element comprises: sensing whether there is the selection input generated on the collage image; determining location coordinates corresponding to the pixel location where the selection input is generated; determining a gray level at the location coordinates from the label map; and obtaining the at least one element of the image element and the text element corresponding to one of the plurality of media contents corresponding to the gray level. sensing whether there is the selection input generated on the collage image; determining location coordinates corresponding to the pixel location where the selection input is generated; determining a gray level at the location coordinates from the label map; and obtaining the at least one element of the image element and the text element corresponding to one of the plurality of media contents corresponding to the gray level.