1. An image processing device capable of selecting a field, the device comprising: a field selector to select a field to be used to interpolate a current field based on difference values in field data between first, second, and third consecutively input fields in an input image, the field to be used to interpolate the current field being one of the first and third fields, and the current field being the second field; a film detector to generate a pattern based on the difference values in the field data between the fields and to determine whether the input image is a film image based on the generated pattern; and an interpolator to interpolate the second field using the one of the first and third fields selected by the field selector, if the film detector determines the input image to be the film image.