To compare body signal, was designed the F-B function system on the body movement for the comfortable state. To detect subject of the normal state, was decided on the base of physical signal in the body movement. There are to detect the condition of Vision, Vestibular, Somatosensory and CNS. Vision condition was verified a variation of greater average (Vi-${Phi}_{AVG-AVG}$) was presented slightly greater at $17.424{pm}9.65$ unit. Vestibular condition was identified a variation of slightly greater average (Ve-${Phi}_{AVG-AVG}$) was presented at $9.068{pm}1.478$ unit. Somatosensory condition was checked a variation of smaller average (So-${Phi}_{AVG-AVG}$) was presented slightly smaller at $2.79{pm}0.419$ unit. CNS condition was confirmed a variation of diminutive smaller average (C-${Phi}_{AVG-AVG}$) was presented slightly larger at $0.557{pm}0.153$ unit. As the model depends on the F-B function system of body movement, average values of these perturbation were computed F-B function comparison data. These systems will be to infer a data algorithm and a data signal processing system for the evaluation of the stability.