An interface apparatus includes: a plurality of force plates provided over a floor of a real space; and an output section that provides, with respect to a plurality of users, a simulation apparatus configured to generate a virtual space with an output signal from a force plate 11 that has detected a foot pressure of a user and a signal indicating a position of the user on the floor and a posture of the user, the position and the posture each having been specified on the basis of a position of the force plate on the floor.