A database management apparatus which manages a database having a hierarchical classification structure is described. In a first embodiment, an error log can be received including log data associated with an error. According to mode zero, each of the pixels in the block is associated with one of the plurality of generated representative color values to generate error map values and a mode zero color error value. It is also possible to separate a charge pumping power supply interconnection and a peripheral circuit power supply interconnection in the vicinity of the power supply pad. This DA converter in accordance with the invention may consist of a resistor ladder or a directly digitally controlled capacitor.