Provided are an electrical stimulation device configured so that a correspondence among finger motion and electrodes can be clarified in a short amount of time regardless of the state of attachment to a user's arm and an individual difference and an intended finger can be driven at high accuracy with very few erroneous operation and an electrical stimulation system using the electrical stimulation device. When an electrode probability matrix in which a Bayesian posterior probability indicating an electrode-finger correspondence is described as an element is updated in a host, the position of an element positioned on the upper left side of the electrode probability matrix and indicating that finger motion occurs is compared to rearrange the columns of the electrode probability matrix as necessary.
