1. A policy description assistance system comprising: a parameter display unit configured to refer to a parameter information storage unit storing a plurality of parameters for a monitoring target system, and display the plurality of parameters on a screen of a display device; a policy display unit configured to refer to a policy information storage unit storing a plurality of policies in which a condition including at least one parameter of the plurality of parameters and a process executed when the condition is satisfied are described, the policy display unit displaying the plurality of policies on the screen, and adding or modifying a policy in the policy information storage unit according to a user input; an association determining unit configured to dynamically determine association between the plurality of parameters stored in the parameter information storage unit and the plurality of policies stored in the policy information storage unit; and an association display unit configured to display the association between the plurality of parameters and the plurality of policies on the screen in an identifiable manner based on determination results of the association determining unit.