In gene expression analysis using DNA chips, the position of a probe on a genome sequence, candidates for splice variants, and the like are displayed in relation to one another. Information on the position of the probe designed for a DNA chip system on the genome sequence is retrieved by connecting to an external database and a server that manage sequence information (genome sequence, mRNA, EST, etc.) and annotation information of various organisms. Further, homologous sequences of a gene for which the probe was designed are detected by homology search program, and the candidates for splice variants obtained from the search are stored in a DNA chip database in relation to expression data.