But he is expected to sign a classified order in coming weeks that will create the military cybercommand, officials said. It is a recognition that the United States already has a growing number of computer weapons in its arsenal and must prepare strategies for their use  as a deterrent or alongside conventional weapons  in a wide variety of possible future conflicts.

The White House office will be run by a “cyberczar,” but because the position will not have direct access to the president, some experts said it was not high-level enough to end a series of bureaucratic wars that have broken out as billions of dollars have suddenly been allocated to protect against the computer threats.

The main dispute has been over whether the Pentagon or the National Security Agency should take the lead in preparing for and fighting cyberbattles. Under one proposal still being debated, parts of the N.S.A. would be integrated into the military command so they could operate jointly.

Officials said that in addition to the unclassified strategy paper to be released by Mr. Obama on Friday, a classified set of presidential directives is expected to lay out the military’s new responsibilities and how it coordinates its mission with that of the N.S.A., where most of the expertise on digital warfare resides today.

The decision to create a cybercommand is a major step beyond the actions taken by the Bush administration, which authorized several computer-based attacks but never resolved the question of how the government would prepare for a new era of warfare fought over digital networks.