It is necessary to enhance team performance by unleashing each member's abilities in order to achieve the goal in business collaboration situations. However, it is a problem when each member does not recognize its strength to demonstrate and the team performance is not enhanced. The purpose of this study is to enhance team performance by making each member able to recognize and unleash its strong points. We propose a method that aims to make individuals understand their situations through an advice sheet from the third person. In particular, the advice writer gives a description of advice to the whole team and individuals, based on the Pre-survey that individual members answered their role recognition of themselves and team members. The method is evaluated by the change in self-acceptance and acceptance of others. The result indicates that the examinees with low self-acceptance and acceptance of others, who are the target of this study, improved their level of acceptance. The analysis of the free descriptions identifies that it follows the process from the understanding of its character and role recognition to the acceptance of others.