We present a data retrieval and information visualisation tool, named the object-oriented graph editor (OOGE). The OOGE is designed to represent information of special kinds of system, hierarchical systems or object-oriented systems. These systems can be represented by object-oriented graph, in which nodes have attributes and their connections are constraint-based. The editor presented provides a friendly graphical user interface for users to define any class of nodes of the OO systems and to draw the OO graph based upon the user-defined node classes. The validity of the proposed system can be checked against the set of constraints that are based on the attributes of the user-defined classes.