1. An apparatus for encoding a multi-view image, the apparatus comprising: a selection unit that obtains a picture in one view image sequence to be encoded by using inter-view prediction from multi-view image sequences and information indicating whether the obtained picture in one view image sequence is a reference picture referred to by others in another view image sequence for inter-view prediction to generate a determination result; and an encoding unit that encodes the obtained pictures by using inter-view prediction and the information wherein the information is included in a network abstraction layer (NAL) unit header, and wherein a picture which is a reference picture referred to by others in another view image sequence for inter-view prediction is included in a reference picture list and a picture which is not a reference picture referred to by others in another view image sequence for inter-view prediction is not included in the reference picture list.