Gene networks have constructed with genes as nodes, and interactions between genes as edges so as to reveal unknown gene functions and relationships. Since nodes and edges of gene networks are usually very numerous, it may be difficult to understand relations between genomic functions and gene-gene interactions, if it is visualized by traditional techniques. This poster presents our technique on visualization of gene networks and gene ontology (GO), which summarizes gene functions and attributes. The technique represents the functions defined by GO terms as colors of nodes, and bundles edges depending on the gene functions to ease visual complication of the network.