Multiple-thread processing apparatuses and methods are provided. The multiple-thread processing method may include searching for loops in a plurality of threads, calculating a number of repetitions of each of found loops in respective threads among the plurality of threads, determining one or more threads based on the calculated number of repetitions of each of the found loops, dividing at least one of the one or more determined threads into child threads, and processing the child threads separately from one another in the plurality of threads.