A non-transitory computer-readable recording medium having stored therein a program that, when a processor coupled to a memory and the processor is configured to execute the program, causes the processor configured to: store, in the memory, a design data of a metal member disposed around the patch antenna having a ground conductor and an antenna element having a power feeding point, and a positional relationship between the metal member and the patch antenna; and determine a relative position between the power feeding point and the metal member so that a center point and the power feeding point of the patch antenna in plan view are located on a perpendicular line to a surface of the metal member on the patch antenna side based on the design data of the metal member and the positional relationship stored in the memory.