A data management apparatus includes a storage device operative to store positional information on objects in a data element space, that is created by organizing a plurality of data elements into a plurality of categories, assigning a subspace to each of the plurality of categories, placing a plurality of subspaces in a multidimensional space, and distributing, in each of the subspaces respectively assigned to the plurality of categories, the objects representing data elements belonging to the associated category; a display unit operative to establish a viewing position and a viewing direction in the data element space, and to generate and display an image of the data element space by referring to the storage device and by rendering the objects located in the data element space; and a control unit operative to acknowledge an instruction for updating the viewing position or viewing direction so as to update them.