In this study, the dehydration of water-in-oil emulsion subjected to an electric field was investigated both experimentally and via computer simulation. The time evolution of the droplets subjected to an electric field was investigated using optical microscopy. We also implemented a computer simulation of the dynamic behavior of the droplets resulting from the balance of forces applied on them. The probability of coalescence between droplets as well as coalescence between droplets and the water/oil interface was also investigated. Thus, the behavior of the droplets could be observed more directly, and the problem could be solved stochastically and mathematically. Through adjustment of the values of the two coalescence probabilities, the simulated results could accurately represent the actual process.