1. An image processing device, comprising: memory configured to hold a feature amount of a feature portion of a model image; a processor configured to receive a setting value indicating a size of a range of searching an input image for a feature amount corresponding to the feature amount of the model image; the processor further configured to determine, by using the setting value, the range of searching the input image for the feature amount corresponding to the feature amount of the model image; and a display configured to display, in superposition with the model image, a search range determined by the processor.