confidence是有信心的意思，而convince则是说服的意思，区别可以从以下例子看出：

He is not confident to accept his job, but I believe I can convince him to take this opportunity, and believe him can finish it 他没有信心接受他的工作，但我相信我可以说服他抓住这个机会，相信他能完成它.

confidence的意思是信心。convince的意思是说服。