A base station comprising: an acquisition unit configured to acquire a first set of weight coefficients for forming a beam aimed at a terminal apparatus , for each of two or more antenna groups each including a portion of a plurality of antenna elements included in a directional antenna capable of forming a three-dimensional beam; and a determination unit configured to determine a second set of weight coefficients for the plurality of antenna elements for forming a three-dimensional beam aimed at the terminal apparatus , on the basis of the sets of the weight coefficients for the two or more antenna groups ; wherein the acquiring a first set of weight coefficients comprises: acquiring a set of weight coefficients for forming a first beam for at least one antenna group of the two or more antenna groups when an angle between the direction of radiation of a beam aimed at the terminal apparatus and a horizontal plane is within a predetermined angle range, and acquiring a set of weight coefficients for forming a second beam for at least one antenna group of the two or more antenna groups when the angle is outside the predetermined angle range, wherein the second beam has a weaker directivity than the first beam; and wherein the determining a second set of weight coefficients comprises: determining a set of weight coefficients for the plurality of antenna elements for forming a three-dimensional beam aimed at the terminal apparatus when the angle is within the predetermined angle range, and determining a set of weight coefficients for the plurality of antenna elements for forming a beam aimed at the terminal apparatus when the angle is outside the predetermined angle range. an acquisition unit configured to acquire a first set of weight coefficients for forming a beam aimed at a terminal apparatus , for each of two or more antenna groups each including a portion of a plurality of antenna elements included in a directional antenna capable of forming a three-dimensional beam; and a determination unit configured to determine a second set of weight coefficients for the plurality of antenna elements for forming a three-dimensional beam aimed at the terminal apparatus , on the basis of the sets of the weight coefficients for the two or more antenna groups ; wherein the acquiring a first set of weight coefficients comprises: acquiring a set of weight coefficients for forming a first beam for at least one antenna group of the two or more antenna groups when an angle between the direction of radiation of a beam aimed at the terminal apparatus and a horizontal plane is within a predetermined angle range, and acquiring a set of weight coefficients for forming a second beam for at least one antenna group of the two or more antenna groups when the angle is outside the predetermined angle range, wherein the second beam has a weaker directivity than the first beam; and acquiring a set of weight coefficients for forming a first beam for at least one antenna group of the two or more antenna groups when an angle between the direction of radiation of a beam aimed at the terminal apparatus and a horizontal plane is within a predetermined angle range, and acquiring a set of weight coefficients for forming a second beam for at least one antenna group of the two or more antenna groups when the angle is outside the predetermined angle range, wherein the second beam has a weaker directivity than the first beam; and wherein the determining a second set of weight coefficients comprises: determining a set of weight coefficients for the plurality of antenna elements for forming a three-dimensional beam aimed at the terminal apparatus when the angle is within the predetermined angle range, and determining a set of weight coefficients for the plurality of antenna elements for forming a beam aimed at the terminal apparatus when the angle is outside the predetermined angle range. <EOS>