A CNN processing apparatus (1) includes an input buffer (10) configured to store an input signal given to a CNN, a storage unit (12) configured to store a table (120) in which the input signal given to the CNN and a binary signal corresponding to the value of the input signal are associated with each other, a binary signal acquisition unit (13) configured to acquire the binary signal corresponding to the value of the input signal stored in the input buffer (10) by referring to the table (120), and a convolutional operation unit (14) configured to perform an operation of the CNN based on the binary signal acquired by the binary signal acquisition unit (13). The binary signal has an accuracy complying with a predetermined operation accuracy of the CNN.