Neural network system, application processor having the same, and method of operating the neural network system

Provided are a neural network system, an application processor including the same, and a method of operating the neural network system. The neural network system includes an operation allocating manager configured to divide a request including a plurality of operations for neural network processing into a plurality of sub-requests each including at least one operation, allocate the plurality of sub-requests to dedicated hardware and one or more pieces of general-purpose hardware, and allocate memories for input and output for each of the plurality of sub-requests based on cost information indicating respective costs needed for hardware to access the memories; and a neural network device configured to execute the sub-requests by using the dedicated hardware and the one or more pieces of general-purpose hardware according to a result of the operation allocation. The operation allocating manager allocates different memories to at least two sub-requests of the plurality of sub-requests.