The managing director of a new international information-gathering network, International Reporting Information Systems, said yesterday that the network will not collect information covertly but will rely on the same techniques used by reporters generally.

National Journal publisher Anthony C. Stout said the system's advantages over other information sources are its objectivity, its comprehensiveness and its special tailoring to meet the information needs of its users. The service is incorporated in Holland, but its operations are centered in Arlington.

Former World Bank President Robert McNamara, who serves on an international advisory council supposed to oversee the accuracy and impartiality of the system, said he hopes the information service will stimulate the flow of private capital to developing nations by removing uncertainty surrounding investment in those areas. McNamara said IRIS is one of a handful of private ventures to which he will devote his energies.

Other members of the council are former British prime minister Edward Heath, former Colombian minister of finance Roderigo Botero and former French minister of trade Jean-Francois Deniau.

The service will be phased in during 1982, Stout said. He said the company estimates a worldwide market of approximately 2,000 subscribers for the new product, but IRIS officials said there were no subscribers yet that they could announce.