A surgical apparatus may include a guide apparatus to be used in an arthroscopic procedure and to interact with a passageway through a body portion formed by intersecting first and second holes that may lead into the body portion from different positions, e. A movement of an object is detected with precision even in an environment where illumination varies, irrespective of the relative position of a ridge line of the object and a border of unit blocks. An auctioning subsystem finds the highest one or group of bids for each given lead.