1. An information processing system comprising: a request storing section which stores a processing request including description of a plurality of processed devices which are processing objects and description of a processing content to be performed thereon; a plurality of processing units which share and execute the processing request; and a request dividing unit which divides the processing request stored in the request storing section into processing requests, one of which includes description of processed devices of a number commensurate with processing capacity of the processing unit and description of a processing content to be performed thereon.