A terminal apparatus (100, 300), comprising: an estimation unit (130, 330) adapted to estimate a channel to a base station by using a reference signal transmitted from the base station (200, 400); a selection unit (150, 350) adapted to select a transmission weight desirable for down-link transmission spatially multiplexed with another 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); 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, 300), and a wireless communication unit (110, 310) adapted to receive feedback control information; wherein the feedback controller (160, 360) is adapted to feed back the selected two transmission weights or more to the base station (200, 400) when the selection unit (150, 350) selects two transmission weights or more. wherein the terminal apparatus is adapted to receive a wireless communication service from a first base station as a serving base station (200, 400) on a first channel, wherein the estimation unit 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 (150, 350) is adapted to select a transmission weight desirable for down-link transmission on the second channel in accordance with the estimation result by the estimation unit, wherein the feedback controller (160, 360) is adapted to feed back the transmission weight selected by the selection unit to the second base station (200, 400) via the first base station (200, 400); wherein the wireless communication unit (110, 310) is adapted to receive feedback control information designating transmission weights fed back from another terminal apparatus to the base station, wherein the transmission weights are desirable for first down-link transmission spatially multiplexed on the channel with second down-link transmission from the base station to the another terminal apparatus, and wherein the feedback controller (160, 360) is adapted to feed back the transmission weight selected by the selection unit to the base station when the transmission weight selected by the selection unit is contained in the transmission weights indicated by the feedback control information. an estimation unit (130, 330) adapted to estimate a channel to a base station by using a reference signal transmitted from the base station (200, 400); a selection unit (150, 350) adapted to select a transmission weight desirable for down-link transmission spatially multiplexed with another 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); 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, 300), and a wireless communication unit (110, 310) adapted to receive feedback control information; wherein the feedback controller (160, 360) is adapted to feed back the selected two transmission weights or more to the base station (200, 400) when the selection unit (150, 350) selects two transmission weights or more. wherein the terminal apparatus is adapted to receive a wireless communication service from a first base station as a serving base station (200, 400) on a first channel, wherein the estimation unit 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 (150, 350) is adapted to select a transmission weight desirable for down-link transmission on the second channel in accordance with the estimation result by the estimation unit, wherein the feedback controller (160, 360) is adapted to feed back the transmission weight selected by the selection unit to the second base station (200, 400) via the first base station (200, 400); wherein the wireless communication unit (110, 310) is adapted to receive feedback control information designating transmission weights fed back from another terminal apparatus to the base station, wherein the transmission weights are desirable for first down-link transmission spatially multiplexed on the channel with second down-link transmission from the base station to the another terminal apparatus, and wherein the feedback controller (160, 360) is adapted to feed back the transmission weight selected by the selection unit to the base station when the transmission weight selected by the selection unit is contained in the transmission weights indicated by the feedback control information.