A server (20) of a gait data management system (1) includes: an obtaining unit (211) that obtains a first sensor value obtained when a walker walks with assistance from a walking assistance device (10)； an accumulating unit (212) that accumulates the first sensor value, and the walking assistance device (10) includes: an actuator (111) that drives a joint； a storage unit (114) that stores a walk algorithm that is for determining a drive level of the actuator (111) 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 (212)； a sensor that obtains a second sensor value obtained when the walker walks with assistance from the walking assistance device (10)； a control unit (113) that determines the drive level of the actuator (111) according to the second sensor value using the walk algorithm； and a transmitting unit (116) that transmits the second sensor value to the server (20).
