A three-dimension forming apparatus, comprising: a model material ejection unit for ejecting a model material; a support material ejection unit for ejecting a support material; and a controller arranged to control the model material ejection unit and the support material ejection unit such that the model material and the support material are arranged as a support structure in an arrangement pattern containing the model material and the support material, the support structure supporting or protecting a three-dimensional structure to be formed by the model material and formed by laminating layers containing the model material and the support material in a height direction of the three-dimensional structure, the arrangement pattern being a pattern of the model material and the support material of each of the layers, wherein: the arrangement pattern is a gradation-like pattern in which, as the support structure is positioned closer to the three-dimensional structure, the rate of the support material in the support structure increases, wherein the rate of the support material is the amount of the support material per unit area, and, as the support structure is more distant from the three-dimensional structure, the rate of the model material in the support structure increases, wherein the rate of model material is the amount of the model material per unit area; and the controller is arranged to control the model material ejection unit and the support material ejection unit based on the arrangement pattern set such that the layers which have different arrangement patterns are adjacent to each other in a height direction of the three-dimensional structure. a model material ejection unit for ejecting a model material; a support material ejection unit for ejecting a support material; and a controller arranged to control the model material ejection unit and the support material ejection unit such that the model material and the support material are arranged as a support structure in an arrangement pattern containing the model material and the support material, the support structure supporting or protecting a three-dimensional structure to be formed by the model material and formed by laminating layers containing the model material and the support material in a height direction of the three-dimensional structure, the arrangement pattern being a pattern of the model material and the support material of each of the layers, wherein: the arrangement pattern is a gradation-like pattern in which, as the support structure is positioned closer to the three-dimensional structure, the rate of the support material in the support structure increases, wherein the rate of the support material is the amount of the support material per unit area, and, as the support structure is more distant from the three-dimensional structure, the rate of the model material in the support structure increases, wherein the rate of model material is the amount of the model material per unit area; and the controller is arranged to control the model material ejection unit and the support material ejection unit based on the arrangement pattern set such that the layers which have different arrangement patterns are adjacent to each other in a height direction of the three-dimensional structure.