An electronic device and a controlling method of the electronic device are provided. The electronic device includes a communicator; at least one memory configured to store data for a neural network model; at least one first processor configured to perform a training process of the neural network model; and at least one second processor configured to: perform a plurality of preprocessing processes for the training process, determine a first operation speed of at least one preprocessing process of the plurality of preprocessing processes performed by the at least one second processor and a second operation speed of the training process performed by the at least one first processor, based on the first operation speed being slower than the second operation speed, control the communicator to transmit at least one input value for the at least one preprocessing process to an external device connected to the electronic device, and obtain an output value corresponding to the at least one input value by receiving, through the communicator, a processing result of the external device for the at least one input value from the external device.