An image signal processor including a first data processing circuit, a second data processing circuit, and a multiplexing control circuit configured to transmit first line data included in first frame data and second line data included in second frame data to the first data processing circuit in a time-division multiplexing mode may be provided. The multiplexing control circuit may be further configured to transmit to the first data processing circuit a switching control signal, which indicates whether current line data to be transmitted to the first data processing circuit is the first line data or the second line data.