1. A computer-executable method comprising: searching source code of a web page for a one-dimensional table, wherein the one-dimensional table comprises an attribute identity and an entity identity and is free of an entity identity that corresponds to the attribute identity and the attribute value; if the one-dimensional table is existent in the web page, causing a processor to extract the attribute identity and the attribute value from the source code of the web page; inferring the entity identity that corresponds to the attribute identity and the attribute value; and indexing the attribute value by the entity identity and the attribute identity in a computer-readable database.