A terminal apparatus (100, 300), comprising: an estimation unit (130, 330) adapted to estimate a channel to a base station (200, 400) by using a reference signal transmitted from the base station (200, 400); a selection (150, 350) unit adapted to select a transmission weight desirable for second down-link transmission from the base station to another terminal apparatus (100, 300) spatially multiplexed with first down-link transmission on the channel from a plurality of transmission weight candidates in accordance with an estimation result by the estimation unit (130, 330); and a feedback controller (160, 360) adapted to control feedback of the transmission weight selected by the selection unit (150, 350) to the base station (200, 400); wherein the terminal apparatus is adapted to receive a wireless communication service from a first base station as a serving base station on a first channel, wherein the estimation unit (130, 330) is adapted to estimate a second channel to a second base station by using a reference signal transmitted from the second base station in a neighboring cell, wherein the selection unit is adapted to select a transmission weight desirable for fourth down-link transmission from the second base station to the another terminal apparatus spatially multiplexed with third down-link transmission on the second channel in accordance with the estimation result by the estimation unit (130, 330), wherein the feedback controller is adapted to feed back the transmission weight selected by the selection unit and desirable for the fourth down-link transmission to the second base station via the first base station; and wherein the selection unit is adapted to select the transmission weights desirable for the fourth down-link transmission of a number determined in accordance with parameters related to quality of down-link transmission on the second channel, the number increasing with a decrease of the quality. an estimation unit (130, 330) adapted to estimate a channel to a base station (200, 400) by using a reference signal transmitted from the base station (200, 400); a selection (150, 350) unit adapted to select a transmission weight desirable for second down-link transmission from the base station to another terminal apparatus (100, 300) spatially multiplexed with first down-link transmission on the channel from a plurality of transmission weight candidates in accordance with an estimation result by the estimation unit (130, 330); and a feedback controller (160, 360) adapted to control feedback of the transmission weight selected by the selection unit (150, 350) to the base station (200, 400); wherein the terminal apparatus is adapted to receive a wireless communication service from a first base station as a serving base station on a first channel, wherein the estimation unit (130, 330) is adapted to estimate a second channel to a second base station by using a reference signal transmitted from the second base station in a neighboring cell, wherein the selection unit is adapted to select a transmission weight desirable for fourth down-link transmission from the second base station to the another terminal apparatus spatially multiplexed with third down-link transmission on the second channel in accordance with the estimation result by the estimation unit (130, 330), wherein the feedback controller is adapted to feed back the transmission weight selected by the selection unit and desirable for the fourth down-link transmission to the second base station via the first base station; and wherein the selection unit is adapted to select the transmission weights desirable for the fourth down-link transmission of a number determined in accordance with parameters related to quality of down-link transmission on the second channel, the number increasing with a decrease of the quality.