On the basis of Hanter's model of interpersonal interaction in small groups and experiments on measurement of parameters of a nervous system, the model circumscribing dynamics of interpersonal attitudes with allowance for of temperaments in ideal small group is offered. It is supposed, that all members of group carry out identical time in conversations with the colleagues on group. The implementation of model on the programming language $C^{++}$ Builder and outcomes of computer experiments is described.