A method for controlling a power consumption in a portable terminal and a portable terminal supporting the method are provided. The method includes receiving first data from at least one device, by a main processor; transmitting second data based on the received first data to a sub processor, by the main processor; receiving the second data from the main processor, and determining whether the main processor is in a sleep state, by the sub processor; and when it is determined that the main processor is in a sleep state, maintaining the sleep state of the main processor, receiving the first data from the at least one device, and controlling the at least one device based on the received first data and second data, by the sub processor.