A risk evaluation system for a process system constituted of a plurality of processes, the system comprising: a storage unit; an operation unit configured to receive an operational input of predetermined information for risk evaluation relating to a specific constituent device; a calculation unit configured to calculate first and second factors for use in risk evaluation relating to the specific constituent device on the basis of the predetermined information about the specific constituent device; a risk evaluation unit configured to generate device risk evaluation information to be used for displaying a device risk evaluation matrix defined by two axes, an axis of the first factor and an axis of the second factor; the device risk evaluation matrix including a plot image plotted based on the first and second factors of the specific constituent device; and a display unit configured to display the device risk evaluation matrix using the risk evaluation information; characterized in that the storage unit is configured to store relevance information that correlates identification information for identifying the respective process with identification information for identifying at least a specific constituent device among constituent devices constituting the process; and the risk evaluation unit is configured to generate the device risk evaluation information in identifiable displaying mode by identifying on the display unit for at least one process from the plurality of processes constituting the process system the plot image of those specific constituent devices constituting that same process based on the relevance information stored in the storage unit. a storage unit; an operation unit configured to receive an operational input of predetermined information for risk evaluation relating to a specific constituent device; a calculation unit configured to calculate first and second factors for use in risk evaluation relating to the specific constituent device on the basis of the predetermined information about the specific constituent device; a risk evaluation unit configured to generate device risk evaluation information to be used for displaying a device risk evaluation matrix defined by two axes, an axis of the first factor and an axis of the second factor; the device risk evaluation matrix including a plot image plotted based on the first and second factors of the specific constituent device; and a display unit configured to display the device risk evaluation matrix using the risk evaluation information; the storage unit is configured to store relevance information that correlates identification information for identifying the respective process with identification information for identifying at least a specific constituent device among constituent devices constituting the process; and the risk evaluation unit is configured to generate the device risk evaluation information in identifiable displaying mode by identifying on the display unit for at least one process from the plurality of processes constituting the process system the plot image of those specific constituent devices constituting that same process based on the relevance information stored in the storage unit.