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. The information processing apparatus has an interpreter unit for interpreting the state of the finite state transition machine for processing information on the system to be controlled and for controlling the system to be controlled based on a current state of the system to be controlled represented in the finite state transition machine.