Various databases are constructed according to desired purposes, or due to necessity, in all biological fields. In the life sciences, there are many databases [1-3] for DNA, proteins, or for the chemical structures and classification of various biomolecules. For the chromosomes, containing many genes, advanced databases

for mapping the genes of chromosomes of various species (e.g., humans [4], nematode [5], Arabidopsis [6]) have already been created. On the other hand, for a large number of species, only limited information such as the chromosome number has been released [7,8]. For this reason, we have now designed a chromosome imaging database system in order to assist chromosome researchers as well as researchers in other biological fields.