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 (105, 107) 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 (105, 107); 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 (105, 107) 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 (105, 107) 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 (105, 107) 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 (105, 107); 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 (105, 107) 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 (105, 107) 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 (105, 107) 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 (105, 107) 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.