An image processing method executed by an image processor comprising a displaying unit, a storage unit, and a control unit, wherein the storage unit includes an image data storage unit that stores image data displayed in thumbnail form and a keyword associated with the image data, and the method includes a keyword obtaining step of obtaining the keyword corresponding to the image data stored in the image data storage unit; and a thumbnail image with keyword displaying step of displaying the keyword obtained at the keyword obtaining step on the displaying unit, with the keyword being overlapped with the image data.