An image providing device, including: at least one processor configured to implement: an image receiver configured to receive an image signal; an image encoder configured to encode the image signal into a bitstream based on inter prediction information for a current block of the image signal, wherein the inter prediction information includes at least one of first motion prediction information including a first motion vector, and second motion prediction information including a second motion vector; and an image provider configured to output the encoded bitstream to an image receiving device, wherein the image encoder is further configured to estimate the first motion vector for a first reference picture, obtain a second motion vector candidate list from at least one neighboring block of the current block, and obtain the second motion vector based on the second motion vector candidate list