Interference is mitigated by effective knowledge and/or effective information about an interference signal. A higher layer in which a base station apparatus configures first interference information used for the terminal apparatus to mitigate interference from a cell-specific reference signal and/or second interference information used for the terminal apparatus to mitigate interference at least from a downlink shared channel; and a signal detection unit configured to mitigate the interference from the cell-specific reference signal based on the first interference information and to mitigate the interference at least from the downlink shared channel based on the second interference information.