A base station apparatus , comprising: a higher layer processing unit configured to set NAICS assistance information, wherein the base station apparatus is adapted to configure NAICS assistance information with respect to a primary cell and a secondary cell, and a transmission unit configured to transmit a NAICS assistance information list to a terminal apparatus, said NAICS assistance information list including a plurality of NAICS assistance information, wherein the NAICS assistance information includes at least one of information related to a physical cell ID, information related to a number of CRS antenna ports, information related to a transmission mode, information related to a first power ratio, information related to a second power ratio, and information related to an MBSFN subframe configuration; the first power ratio is a power ratio of the PDSCH in OFDM symbols where the CRS is not mapped, and the CRS, the second power ratio is a power ratio of the PDSCH in OFDM symbols where the CRS is mapped, and the PDSCH in OFDM symbols where the CRS is not mapped, one of the plurality of NAICS assistance information is information about the base station apparatus, and the other of the plurality of NAICS assistance information is information about another base station apparatus, the plurality of NAICS assistance information is information that assists the terminal apparatus to cancel or suppress interference to the primary or secondary cell that the terminal apparatus receives from another base station apparatus; and the primary cell and the secondary cell are used for carrier aggregation in the base station apparatus. a higher layer processing unit configured to set NAICS assistance information, wherein the base station apparatus is adapted to configure NAICS assistance information with respect to a primary cell and a secondary cell, and a transmission unit configured to transmit a NAICS assistance information list to a terminal apparatus, said NAICS assistance information list including a plurality of NAICS assistance information, wherein the NAICS assistance information includes at least one of information related to a physical cell ID, information related to a number of CRS antenna ports, information related to a transmission mode, information related to a first power ratio, information related to a second power ratio, and information related to an MBSFN subframe configuration; the first power ratio is a power ratio of the PDSCH in OFDM symbols where the CRS is not mapped, and the CRS, the second power ratio is a power ratio of the PDSCH in OFDM symbols where the CRS is mapped, and the PDSCH in OFDM symbols where the CRS is not mapped, one of the plurality of NAICS assistance information is information about the base station apparatus, and the other of the plurality of NAICS assistance information is information about another base station apparatus, the plurality of NAICS assistance information is information that assists the terminal apparatus to cancel or suppress interference to the primary or secondary cell that the terminal apparatus receives from another base station apparatus; and the primary cell and the secondary cell are used for carrier aggregation in the base station apparatus. <EOS>