Due to the geographical distribution, different cognitive capacity, and different domain competency of workers or learners, many misunderstandings can occur during Web based remote collaboration, leading to inefficient discussions and undesired results. To overcome these problems, a "Multimedia adaptive utilization" framework for dependable web based collaboration is proposed and evaluated. This assesses situations of remote users through fusing information of multiple biological sensors and the related contexts such as user profiles. Transmitting and using such information, the system adaptively supports Web based remote collaboration by stressing, warning, and presenting keywords/ summaries in multimedia. Then, effects of adaptive keyword/summary presentation are evaluated as to cognitive profiles of users such as short term memory capacity and associative learning skills when misunderstanding possibilities are estimated on the Web. These evaluations totally demonstrate the feasibility and usefulness of the proposed method.