1. An action recognition apparatus comprising: an input unit for inputting image data; a moving-object detection unit for detecting a moving object from the image data; a moving-object identification unit for identifying the detected moving object based on the image data; a state detection unit for detecting a state or an action of the moving object from the image data; and a learning unit for learning the detected state or action by associating the detected state or action with meaning information specific to the identified moving object.