1. A computer-implemented method for expressing information comprising the steps of: extracting attributes of a plurality of data objects, wherein the attributes reflect information associated with the data objects; hierarchically grouping the data objects based on the attributes of the data objects to form a hierarchical structure; establishing basic representation units, wherein the basic representation units include multimedia attributes and each basic representation unit corresponds to at least one data object; establishing a mapping relationship between distinct attributes of the data objects and the multimedia attributes of the basic representation units; and displaying the basic representation units to reflect the hierarchical grouping of the data objects on a multimedia device, wherein the mapping relationship is used to determine the multimedia attributes of the displayed basic representation units.