A control method for an information apparatus having a display and being connected to a network, one or more target devices being controlled over the network, the control method causing a computer of the information apparatus to: display a first display screen representing a first floor plan for a first floor of a building on the display when the first display screen is selected, wherein device icons on the first display screen represent the one or more target devices and the first floor plan includes a first section of a staircase; display a second display screen representing a second floor plan for a second floor of the building different from the first floor on the display when the second display screen is selected, wherein device icons on the second display screen represent the one or more target devices and the second floor plan includes a second section of the staircase; sense that a device icon among the device icons is selected in the first floor plan or in the second floor plan; characterized in that the control method further causes the computer to switch between the first display screen and the second display screen, when selection is sensed of a region corresponding to the staircase on the first floor plan or the second floor plan; but when it is sensed that the region corresponding to the staircase is selected after an illumination icon representing an illumination device (202, 203) in a region corresponding to the staircase included in either the first floor plan or in the second floor plan was selected, then, instead of switching between the first display screen and the second display screen, output to the network a first control command controlling on/off of power for the illumination device (202, 203) corresponding to the selected illumination icon. display a first display screen representing a first floor plan for a first floor of a building on the display when the first display screen is selected, wherein device icons on the first display screen represent the one or more target devices and the first floor plan includes a first section of a staircase; display a second display screen representing a second floor plan for a second floor of the building different from the first floor on the display when the second display screen is selected, wherein device icons on the second display screen represent the one or more target devices and the second floor plan includes a second section of the staircase; sense that a device icon among the device icons is selected in the first floor plan or in the second floor plan; characterized in that the control method further causes the computer to switch between the first display screen and the second display screen, when selection is sensed of a region corresponding to the staircase on the first floor plan or the second floor plan; but when it is sensed that the region corresponding to the staircase is selected after an illumination icon representing an illumination device (202, 203) in a region corresponding to the staircase included in either the first floor plan or in the second floor plan was selected, then, instead of switching between the first display screen and the second display screen, output to the network a first control command controlling on/off of power for the illumination device (202, 203) corresponding to the selected illumination icon.