Abstract: In a power conversion system, a first control unit acquires monitor data from a first power storage unit, notifies a second control unit of a remaining capacity of the first power storage unit, and sets an output voltage of a first DC-AC conversion unit. The second control unit controls an output current of a second DC-AC conversion unit to bring the remaining capacity of the first power storage unit and a remaining capacity of the second power storage unit closer to each other on the basis of a total current supplied to a load, the remaining capacity of the first power storage unit, and the remaining capacity of the second power storage unit.

Abstract: An information exchange system is provided in which users passing each other can realistically exchange opinions on a television program. Hence, the information exchange system includes a television receiver and a portable information terminal which performs short-range communication with the television receiver and another portable information tenuinal, where the television receiver acquires, from a broadcast wave, program information including an identifier and a program name of a specified program, and transmits the program information to the portable information terminal within a range of the short-range communication, and the portable information terminal acquires the program information from the television receiver, associates a comment with the acquired program information to receive an input of the comment and exchanges the comment with another portable information terminal which comes into the range of the short-range communication.