A server of a gait data management system includes: an obtaining unit that obtains a first sensor value obtained when a walker walks with assistance from a walking assistance device； an accumulating unit that accumulates the first sensor value, and the walking assistance device includes: an actuator that drives a joint； a storage unit that stores a walk algorithm that is for determining a drive level of the actuator and is generated through statistical processing on a gait value indicating walking characteristics and calculated from the first sensor value accumulated in the accumulating unit； a sensor that obtains a second sensor value obtained when the walker walks with assistance from the walking assistance device； a control unit that determines the drive level of the actuator according to the second sensor value using the walk algorithm； and a transmitting unit that transmits the second sensor value to the server.
