A terminal device, comprising: a channel information acquiring unit, configured to acquire first channel information, wherein the first channel information comprises one or more of the following information: first channel state information, CSI, obtained by measuring a first channel and reflecting a channel state of a whole antenna, and first measurement configuration information used for measuring the first channel; the first CSI includes one or more of the following information: a rank indication, RI, a precoding matrix indicator, PMI, and a channel quality indicator, CQI; a configuration information receiving unit, configured to receive second measurement configuration information sent by a base station and used for measuring a second channel; wherein the terminal device further comprising: a channel measurement unit, configured to measure the second channel according to the first channel information and the second measurement configuration information, to obtain second CSI that reflects a channel state of a partial antenna, wherein the channel measurement unit comprises: a second CSI range determining unit, configured to determine, according to the first channel information, a second CSI range for measuring the second channel, the second CSI range being a restrictive CSI measurement range; and a second channel measurement unit, configured to measure, according to the second measurement configuration information, the second channel in the second CSI range for measuring the second channel. a channel information acquiring unit, configured to acquire first channel information, wherein the first channel information comprises one or more of the following information: first channel state information, CSI, obtained by measuring a first channel and reflecting a channel state of a whole antenna, and first measurement configuration information used for measuring the first channel; the first CSI includes one or more of the following information: a rank indication, RI, a precoding matrix indicator, PMI, and a channel quality indicator, CQI; a configuration information receiving unit, configured to receive second measurement configuration information sent by a base station and used for measuring a second channel; wherein the terminal device further comprising: a channel measurement unit, configured to measure the second channel according to the first channel information and the second measurement configuration information, to obtain second CSI that reflects a channel state of a partial antenna, wherein the channel measurement unit comprises: a second CSI range determining unit, configured to determine, according to the first channel information, a second CSI range for measuring the second channel, the second CSI range being a restrictive CSI measurement range; and a second channel measurement unit, configured to measure, according to the second measurement configuration information, the second channel in the second CSI range for measuring the second channel. a channel measurement unit, configured to measure the second channel according to the first channel information and the second measurement configuration information, to obtain second CSI that reflects a channel state of a partial antenna, wherein the channel measurement unit comprises: a second CSI range determining unit, configured to determine, according to the first channel information, a second CSI range for measuring the second channel, the second CSI range being a restrictive CSI measurement range; and a second channel measurement unit, configured to measure, according to the second measurement configuration information, the second channel in the second CSI range for measuring the second channel. a second CSI range determining unit, configured to determine, according to the first channel information, a second CSI range for measuring the second channel, the second CSI range being a restrictive CSI measurement range; and a second channel measurement unit, configured to measure, according to the second measurement configuration information, the second channel in the second CSI range for measuring the second channel.