To provide a new method for autonomously controlling the behavior of a control target device based on a stimulating action and a suppressing action among antibodies in an immune network, an operating unit 3 calculates an antibody concentration ai(t) serving as an index for selecting an antibody module ABi, while plural antibody modules ABi different in stimulating conditions are set as processing targets. A convergence judging unit 4 judges whether the antibody concentration ai(t) is converged to a predetermined target value ri. When a judgment of non-convergence is made, a convergence controlling unit 5 calculates a correction parameter ul(t) for correcting the antibody concentration so that the antibody concentration ai(t) approaches to the target value ri. When a judgment of convergence is made, an antibody estimating unit 7 calculates an estimation value Pi, and selects some antibody module ABi based on the estimation values Pi calculated for the plural antibody modules. The behavior of the control target device is controlled in accordance with a control content defined by the selected antibody module ABi.