The embodiments of the present application provide a method and a state control apparatus as well as a portable terminal. The method is applied in a first system connected to a second system and includes: detecting, by the first system, a first event; determining a first state of the first system and a second state of the second system when the first event is a first predetermined event; obtaining a predetermined policy including a first control command and a second control command based on the first state of the first system, the second state of the second system and the first predetermined event; and controlling, by the first system, its own state based on the first control command and transmitting the second control command to the second system such that the second system is switched from the second state to a fourth state. The second system has different power consumptions in the second state and the fourth state. With the embodiments of the present application, in a portable terminal of hybrid system architecture, the system states of the first and second systems can be controlled in a coordinated manner, such that the power consumption can be reduced when both systems are operating cooperatively.