An image processing apparatus includes: an operation receiver, an image processor configured to perform image processing to add a digital watermark containing address information of the image processing apparatus to a first image to thereby generate a second image; a communication controller configured to receive a taking-out request to take out the digital watermark contained in the second image from an information processing device; and a storage controller configured to store a log in a storage unit. When receiving the taking-out request, the image processor performs image processing to take out the digital watermark contained in the second image to thereby generate the first image. The communication controller transmits the first image generated by the image processor to the information processing device. The storage controller stores, in the storage unit, the log containing identification information identifying the user of the information processing device from which the taking-out request is transmitted.