Government officials have asked for patience, saying Mexico’s crime problems cannot be solved overnight.

They have made it clear that they want to break with the approach of former President Felipe Calderón, who heavily enlisted the military and the federal police against crime gangs, but the new government has taken a similar tack in recent flare-ups, including sending a cadre of federal police officers to Acapulco after the attacks there. Government officials have pledged closer coordination between the federal police and the state authorities.

Officials are promoting the less militaristic crime prevention program introduced last week as a linchpin, with Mr. Peña Nieto personally announcing it and Interior Secretary Miguel Ángel Osorio Chong briefing reporters extensively on it. On Thursday, an under secretary presented a slick brochure on the program to foreign journalists and answered questions for 45 minutes.

“It’s clear that we must put special emphasis on prevention, because we can’t only keep employing more sophisticated weapons, better equipment, more police, a higher presence of the armed forces in the country as the only form of combating organized crime,” Mr. Peña Nieto said in announcing the program in Aguascalientes, one of the more peaceful precincts in the country.

The program calls for creating an interagency commission that would spend $9 billion in the coming years in 250 of the most violent cities and towns, beginning with the worst. The plan envisions longer school days, drug addiction programs and other social efforts in addition to public works projects, but officials said specifics were still being worked out and would be detailed later.

It resembles a plan Mr. Calderón put in place a few years ago for Ciudad Juárez, one of the bloodiest cities in Mexico, but government officials said that while they studied that project, they believed that their plan differed in ambition and scope.

Few argue with the need for such programs and alternatives to crime for young people. But security analysts faulted Mr. Calderón for not attacking corruption by building effective, accountable local and state police and judicial institutions, a herculean task that Mr. Peña Nieto so far has not shown much sign of taking on either.