an image information control apparatus includes a partial write detector having at least two types of memory units for detecting and storing addresses accessed to a vram in units of lines in a scanning direction , thereby repeating the detection and the storage at different cycles , a circuit for performing calculations to recognize partial write information from contents of each of the memory units , memory units for storing the respective calculation results , a circuit for comparing the memory contents to determine a size relationship between partial write areas , a partial write id signal controller for controlling a partial write id signal on the basis of the size relationship between partial write areas and externally outputting the signal , and a circuit for , even when partial writing is being executed , forcibly interrupting the partial writing in accordance with a state of an external refresh control signal , starting refresh , and restarting the partial writing in accordance with a partial write state and a change in state of the refresh control signal .