Abstract: An information processing apparatus uses a triad-based state transition model which is implemented in a state machine for making rational determinations on the state of a system of interest and for controlling the same to an appropriate state. The triad-based state transition model is stored in a memory unit of the apparatus and made up of a first group of states for defining natural behavior of the system to be controlled irrespective of forced actions; a second group of states for defining forced actions for directing the behavior of the system to be controlled to a target; and a third group of state for defining target states to which the system to be controlled may proceed from the first group of states as a result of determining natural behavior of the system based on a first predetermined threshold value, and as a result of determining a change in the system behavior due to a forced action based on a second predetermined threshold value.