Abstract
On the earth, many organisms are present and lives depending on each other. Above all, the relation between prey agents and predator agents is a typical example of the interdependence among organisms.
In this research, we formulate the relation between prey agents and predator agents as an agent based model, and then analyze the effect of the number of agents or their behavior on the equilibrium holding between two types of agents. The aim is to find out conditions for the equilibrium to continue.