1. An analyzing model creating apparatus comprising: a storage unit; a display unit; and a processing unit, wherein the processing unit comprises: a part configured to store, in the storage unit, a three-dimensional analyzing model of an analyzing target, represented by a coordinate system, and regions of the three-dimensional analyzing model; a generating part configured to obtain a reference point on an impact surface from a normal vector of the impact surface, represented by a unit vector, and a minimum value and a maximum value of coordinates along each coordinate axis of the regions of the three-dimensional analyzing model, and to generate and store, in the storage unit, the impact surface defining an impact attitude of the three-dimensional analyzing model at which the three-dimensional analyzing model collides with the impact surface by an arbitrary rotary position of the impact surface with respect to the three-dimensional analyzing model; a part configured to generate an analysis input file which includes information related to the three-dimensional analyzing model, the impact surface, and an impact velocity with which the three-dimensional analyzing model and the impact surface collide, to store the analysis input file in the storage unit; and an analyzing part configured to analyze a strength of the three-dimensional analyzing model based on the information included in the analysis input file, to display analysis results indicating results of analyzing the strength of the three-dimensional analyzing model on the display unit, wherein the impact attitude of the three-dimensional analyzing model is changed by rotating the impact surface so that the coordinate system representing the three-dimensional analyzing model remains unchanged at each rotary position of the impact surface.