1. A field picture coding method, the method comprising: selecting a reference field from a plurality of candidate fields with respect to an input image, wherein the selecting comprises selecting a single closest field in time to the input image as a main reference field and selecting a second closest field in time to the input image as a subsidiary reference field; generating a predictive image by deinterlacing with respect to the selected reference field; and performing, by way of a processor, predictive coding with respect to the input image using the predictive image.