On Thursday Mr. Idei, who is 58 years old, and Norio Ohga, 65, the chairman of the Sony Corporation, went to San Francisco, where they gave the go-ahead for developing a complex of theaters, restaurants and other shops at Yerba Buena. The company hopes to marry software and hardware offerings by selling video games, computers and other Sony products. Its SW Networks produces and distributes music and entertainment programming for radio, and it puts Sony's pictures, music and electronics on line. If Sony has any plans to bring in a new American manager, there was no indication of that yesterday. Though some executives believe that Mr. Idei will ultimately bring an American outsider to run the entertainment businesses, for now Mr. Idei seems quite willing, even eager, to take over, several executives close to Sony said.