If a designation detector detects one of icons representing peripheral equipment (image forming apparatuses) displayed on a monitor screen by a display controller in response to operator's manipulation, an operation information acquirer acquires, from the respective peripheral equipment, operation information indicating a job status of the respective peripheral equipment represented by all the icons displayed on the monitor screen. If it is judged that the peripheral equipment represented by the icon whose designation has been detected by the designation detector is in a state of processing a job, the display controller changes the display format of the icon representing a peripheral equipment in an idling state.