1. An information extraction apparatus, comprising: distance image input means for inputting a distance image including a plurality of objects to be respectively recognized; area division means for dividing the distance image into a plurality of areas according to position information of a plurality of blocks and for identifying blocks containing an active event; and image processing means for recognizing the plurality of objects in the areas corresponding to the blocks containing an the active event, and for supplying the recognition result to a system of the active event.