1. An information processing system comprising: a plurality of terminals attached to the persons comprising an organization; a base station to communicate with the terminals; and a management server coupled by way of a network to the base station, wherein each terminal includes a behavioral information sensor to acquire behavioral information on the person wearing the terminal, and a transmit device to send the behavioral information to the base station, wherein the management server comprising a network interface coupled to the network, a processor coupled to the network interface, and a storage device coupled to the processor, wherein the storage device stores person-related information showing pre-defined relations among the plurality of persons within the organization, and wherein the processor: stores the behavioral information received by way of the network interface into the storage device, calculates the behavioral characteristic quantity of one or more types showing behavioral characteristics of each person relative to other persons based on the behavioral information; stores the calculated behavioral characteristic quantity in the storage device, sums the calculated behavioral characteristic quantities for each of the defined relations between each person and the other persons, further stores the summed behavioral characteristic quantities in the storage device; and when information showing a still non-implemented change in the defined relation is acquired, estimates the behavioral characteristic quantity of the person after the defined relation is changed in accordance with the acquired information based on the acquired information and the behavioral characteristic quantity stored in the storage device, and outputs the estimated behavioral characteristic quantity.