There is disclosed an apparatus having a base, a shaft, a swivel joint assembly and plural stories. An acquiring unit acquires, from a structure-information storing unit, statistical information corresponding to a logical structure to be retrieved. The grating adjustment structure has a cam plane abut to an abut plane formed at a portion apart from the axis line of said optical parts accommodation module and including a slide cam member mounted in such a condition that said slide cam member is regulated to be movable on a straight line with respect to said carriage body . The plurality of correlated test streams is provided to at least one stream processing system.