A recording medium in which a computer program for causing a computer to realize a function to control a GUI image to be displayed on a display covered by a touch panel is recorded, the computer program being characterized by realizing a function to read out, from a memory, a GUI placement information file created as a standard setting irrespective of a display size and compare actual size of the display with a condition with respect to the display size, obtained from setting values of position and size of a GUI recorded in the file,
- a function to finally decide the position and size of the GUI and generate the GUI image by carrying out adjustment corresponding to a comparison result, and display the GUI image on the display, and
- a function to identify contents of operation carried out by the user from a correspondence relationship between a contact point detected by the touch panel and the GUI image being currently displayed.