1. An information processing system comprising: log acquisition means, for obtaining a log for operations performed during information processing; graph preparation means, for setting, as nodes on a graph, said operations of said log obtained by said log acquisition means, and for connecting said nodes with arcs in the order of the performance of said operations to prepare a graph that represents a transient condition wherein said operations are shifted; and graph display means, for visually presenting said graph prepared by said graph preparation means.