We report the C language implementation of a program that merges SNP data from all samples and estimates various statistical quantities related to SNP. The software combines the SNP information from different samples according to the SNP position in the nucleotide sequence. The combined SNP information is converted into HapMap format that can be used as an input for genome-wide association analysis for quantitative traits. The software additionally provides estimates of the minor allele frequency, the heterozygosity ratio, and the In/Del frequency. The software is prepared as a stand-alone program and is downloadable from http://info.kongju.ac.kr/snpmerge/.