Neural network processor and convolution operation method thereof

A neural network processor for performing a neural network operation may include a memory storing computer-readable instructions, and kernel intermediate data, the kernel intermediate data including a plurality of kernel intermediate values calculated based on a plurality of weight values included in kernel data; and at least one processor to execute the computer-readable instructions to perform a convolution operation by selecting at least one kernel intermediate value among the plurality of kernel intermediate values based on an input feature map.