Tokyo, Japan – The Sony Corporation developed a prototype small biped entertainment robot “SDR-4X ” that adapts its movement to its surroundings and events found in homes to help develop the for a biped-walking robot. Better communication with people can be experiences by the variety of sensor systems, performance control software based on memory and learning, and a flexible biped walking mechanism. The image recognition, sound recognition, and sound synthesis technologies, communication and movement control technology based on memory is incorporated in the SDR-4X to further enrich communications with people. Information on people and the location of an object obtained through image recognition technology is used as short and long term memory information. Based on this information, the SDR-4X can realize more complicated communication and movements.