PROBLEM TO BE SOLVED: To provide a program capable of converting a GUI of an installed application between information equipment having input devices and output devices whose types and specs are different.SOLUTION: A GUI conversion program allows a computer to function as: means for calculating a conversion source operability evaluation scale corresponding to an operation object on the basis of conversion source GUI information; means for calculating a conversion destination operability evaluation scale corresponding to the operation object to be operated in accordance with an operation method in the GUI of a conversion destination; means for setting a GUI region including only the operation object belonging to a group for each group obtained by classifying the operation objects on the basis of their mutual positional relations; operation system determination means for determining whether to divide the GUI of the conversion source on the basis of the degree of a difference between the conversion source operab
