By providing bio-information and/or environment information between a pair of users, it becomes possible for the users to understand the situation or the feeling of each other more deeply and earlier. A communication system for exchanging the situations and the feelings of both users is provided without performing optional communication operations, such as a telephone call and an e-mail. The condition or the situation on the transmitter side is to be judged and to be notified to the receiver side by inputting bio-information such as breathing, pulse-beats and heartbeats or environment information such as weather, date and hour, ambient temperature, or alternatively, by comparing, synchronizing and/or relating the bio-information and/or the environment information at present with respect to the bio-information and/or the environment information in the past. With respect to the situation of the receiver side, it is also notified similarly to the transmitter side.