1. A fault cause extraction apparatus comprising: a storage unit which stores a correlation model including one or more correlation functions, each of which is generated based on a time series of performance information including a plurality of types of performance values in a system and transforms a performance value for one of said types comprising an input to a performance value for another one of said types comprising an output; and a correlation-destruction-propagation detecting unit which calculates a degree of influence upon said system of a performance value for a base point that comprises said one of said types, based on a number of base point propagation functions, wherein said number of base point propagation functions equals a number of said correlation functions used to transform a performance value for said base point to a performance value for said other one of said types.