1. An image processing device comprising: circuitry configured to operate as: a predictive motion vector generating unit that: sets a co-located vector to be not available in a candidate list as a condition that a type of a reference picture of a current block is different from a type of the reference picture of a co-located block included in a co-located picture; sets the co-located vector to be available and to be scaled in the candidate list as a condition that both the type of the reference picture of the current block and the type of the reference picture of the co-located block are short-term reference pictures; sets the co-located vector to be available and to be not scaled in the candidate list as a condition that both the type of the reference picture of the current block and the type of the reference picture of the co-located block are long-term reference pictures; and generates a predictive motion vector of a coding vector of the current block using the candidate list; and a motion vector encoding unit that encodes the coding vector by using the predictive motion vector generated by the predictive motion vector generating unit.
2. The image processing device according to claim 1, wherein the predictive motion vector generating unit sets the co-located vector to be not available in the candidate list as a condition that the type of the reference picture of the current block is a long-term reference picture and the type of the reference picture of the co-located block is a short-term reference picture.
3. The image processing device according to claim 1, wherein the predictive motion vector generating unit sets the co-located vector to be not available in the candidate list as a condition that the type of the reference picture of the current block is a short-term reference picture and the type of the reference picture of the co-located block is a long-term reference picture.
4. The image processing device according to claim 1, wherein the predictive motion vector generating unit scales the co-located vector based on a positional

relationship between the current picture and a reference picture referred to generate the predictive motion vector of the coding vector.
5. The image processing device according to claim 1, wherein the circuitry comprises a Central Processing Unit (CPU).
6. An image processing method performed by an image processing device, comprising:
setting a co-located vector to be not available in a candidate list as a condition that a type of a reference picture of a current block is different from a type of the reference picture of a co-located block included in a co-located picture; setting the co-located vector to be available and to be scaled in the candidate list as a condition that both the type of the reference picture of the current block and the type of the reference picture of the co-located block are short-term reference pictures; setting the co-located vector to be available and to be not scaled in the candidate list as a condition that both the type of the reference picture of the current block and the type of the reference picture of the co-located block are long-term reference pictures; generating a predictive motion vector of a coding vector of the current block using the candidate list; and encoding the coding vector using the generated predictive motion vector.
7. The image processing method according to claim 6, wherein the co-located vector is set to be not available in the candidate list as a condition that the type of the reference picture of the current block is a long-term reference picture and the type of the reference picture of the co-located block is a short-term reference picture.
8. The image processing method according to claim 6, wherein the co-located vector is set to be not available in the candidate list as a condition that the type of the reference picture of the current block is a short-term reference picture and the type of the reference picture of the co-located block is a long-term reference picture.
9. The image processing method according to claim 6, further comprising: scaling the co-located vector based on a positional relationship between the current picture and

a reference picture referred to generate the predictive motion vector of the codin vector.
10. The image processing device according to claim 1, wherein the motion vecto encoding unit uses a merge mode to encode the coding vector.
11. The image processing method according to claim 6, wherein encoding comprise using a merge mode to encode the coding vector.
12. The image processing device according to claim 1, wherein the motion vecto encoding unit uses an AMVP mode to encode the coding vector.
13. The image processing method according to claim 6, wherein encoding comprise using an AMVP mode to encode the coding vector.
14. The image processing device according to claim 1, wherein the predictiv motion vector generating unit sets the co-located vector to be not available by excludin the co-located vector from a candidate vector.
15. The image processing method according to claim 6, wherein setting the co located vector to be not available comprises excluding the co-located vector from candidate vector.