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 of the person wearing the terminal, the behavioral information sensor including: a face-to-face sensor to detect a face-to-face meeting between the person wearing the terminal and another person wearing the terminal, and at least one of an acceleration sensor to detect acceleration and a voice sensor to detect voices, and each terminal includes a transmit device to send the behavioral information to the base station, the behavioral information including: face-to-face information corresponding to the face-to-face meeting between the person wearing the terminal and the other person wearing the terminal, and at least one of acceleration information from the acceleration sensor and voice information from the voice sensor; 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 a plurality of organizational relationships in an organizational structure 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 a relational characteristic quantity of one or more types for each person in each of the organizational relationships relative to each other person in the organizational relationship based on at least one of the face-to-face information, the acceleration information and the voice information, wherein the relational characteristic quantity comprises at least one of a face-to-face time between the person and the other person, a bidirectional time where the person and the other person were both active, a pitcher time where the person was active and the other person was inactive, a catcher time where the person was inactive and other person was active, a sit-together time where the person and the other person were both inactive, and a synchronicity degree where the person transits from inactive to active when the other person is active, calculates a relational coefficient based on a change in the relational characteristic quantity resulting from a past change in one or more of the organizational relationships in the organization structure, receives a proposed change in one or more of the organizational relationships in the organizational structure, determines a change in the relational characteristic quantity of each person in the organizational structure resulting from the proposed change in the one or more organizational relationships using the calculated relational coefficient, and outputs the change in the relational characteristic quantity of each person in the organizational structure resulting from the proposed change in the one or more organizational relationships.