1. A risk analysis device including: an influence degree computation unit configured to compute, on the basis of risk factor influence information representing a relation between a component having a risk factor included in a system for providing services and other components included in the system which are to be influenced by a state of said component, component characteristic information representing characteristics of each of said risk factors, and service information representing correspondence between said services and said components, a service influence degree corresponding to each of said risk factors with respect to each of said services; and a risk group generation unit configured to compute, on the basis of said service influence degrees, similarities between a specific one of said risk factors and the other ones of said risk factors, and generate and output information including at least a set of pieces of identification information each representing said component corresponding to said risk factor selected on the basis of said similarities.