A method and a system for managing sensor information in a portable terminal are provided. The method includes collecting the sensor information through a sensor unit by a sub-controller, determining whether a main controller is in a sleep state, determining whether the collected sensor information is able to be stored in a sub-memory when the main controller is in the sleep state, storing the collected sensing information in the sub-memory, and waking-up the main controller to move the collected sensor information and sensor information stored in the sub-memory to a main memory to store therein when the collected sensor information is unable to be stored in the sub-memory.