To securely print the whole of an intended image.

An image data analysis part 21 detects the numbers of longitudinal and lateral dots of photographic video data to be printed by analyzing a header part in information outputted from a digital camera to detect and a printer analysis part 22 detects the size of recording paper which is actually loaded. When the image data are printed under conditions set by an output setting part 23, the size of the image data is corrected on the basis of the detected size of the image data, the size of the recording medium, and the set conditions and the image data are outputted to a printer engine.