[en] The Japan Atomic Energy Agency has been conducting research and development (R and D) on partitioning and transmutation (P and T) technology for long-lived nuclides in accordance with the Atomic Energy Commission's Research and Development of Technologies for Partitioning and Transmutation of Long-lived Nuclides - Status and Evaluation Report' issued in 2000. The present report reviews the progress of the investigation on the benefit and the cost of the P and T technology, the international trend of R and D, the progress and the future plan of R and D on the partitioning process and the transmutation cycle technology, together with the necessary infrastructure improvement including the Transmutation Experimental Facility as the Phase-II of the Japan Proton Accelerator Research Complex (J-PARC). (author)