FIG. 13 is a schematic diagram showing a color information setting screen of an image display unit 11 of the facility equipment management apparatus according to the third embodiment. The color information setting screen includes a hue difference value display box 56 that displays a hue difference value indicating a difference from the present hue value, an Add button 52, a Subtract button 53, an OK button 54, and a Cancel button 55.

The hue difference value display box 56 is provided to display an amount of change from the present hue value. The hue difference value is displayed is an integer value in a range of +180 to ?180.

The Add button 52 is an operation button for increasing the hue difference value (adding 1). If the Add button 52 is pressed when the hue difference value is +180, the hue difference value changes to ?180. The hue value after the addition with the Add button 52 is a temporary hue value and is not a determined value until the OK button 54 is pressed.

The Subtract button 53 is an operation button for decreasing the hue difference value (subtracting 1). If the Subtract button 53 is pressed when the hue difference value is ?180, the hue difference value changes to +180. The hue value after the subtraction with the Subtract button 53 is a temporary hue value and is not a determined value until the OK button 54 is pressed.

The OK button 54 is an operation button for changing the hue value based on the hue difference value and setting it as the present hue value. The new hue value is calculated as the following expression:
(New hue value)=(Present hue value)+(Hue difference value)