SEOUL, JUNE 22 -- South Korean President Chun Doo Hwan, facing the most violent opposition to his seven-year rule, was reported today to have agreed to meet opposition leader Kim Young Sam as part of a series of concessions to help defuse the nearly two weeks of antigovernment rioting.

Chun is also expected to accept opposition demands to lift the two-month-old house arrest of another leading opposition figure, Kim Dae Jung, and to release hundreds of demonstrators arrested since the disturbances began June 10, newspapers and television reported today, quoting ruling party officials.

The opposition has said that the release of those jailed and the lifting of Kim Dae Jung's house arrest are the preconditions for a meeting between Chun and Kim Young Sam, who heads the main opposition party. A spokesman for Kim Young Sam said today he assumes the conditions would be met.

Reached by telephone tonight in his home, which is guarded by scores of uniformed and plainclothes police, Kim Dae Jung said he had not yet received formal notification about a release, but added, "There is information that the house arrest will be lifted very soon."

Earlier this afternoon, U.S. Embassy political counselor Harry Dunlop met with Kim Dae Jung at his home, the opposition leader said. He declined to elaborate.

Even if the house arrest were lifted, Kim would still be banned from politics and remain under a suspended sentence for sedition.

Kim's house arrest, the 53rd by his count since the former presidential candidate's return from U.S. exile in February 1985, was imposed April 8. A few days later, on April 13, Chun announced his decision to postpone until after next year's Summer Olympics a dialogue with the opposition aimed at amending the constitution. The opposition wants the change to allow direct popular election of the president.

That decision was immensely unpopular and lies at the root of the current crisis. One of the common chants of student demonstrators has been to call on Chun to "reverse the April 13 decision."

After meeting with Chun today, ruling Democratic Justice Party chairman Roh Tae Woo said he suggested to Chun "that due consideration be given to opposition requests that the house arrest of Kim Dae Jung be lifted and the persons arrested for their roles in the opposition rallies be released." Korean reporters quoted Roh as saying, "My suggestion was accepted."

Today's developments came as the focus shifted from the subsiding street protests to the government's political response. Clashes were reported at universities in Seoul, and there were reports of continued demonstrations in other cities, but the number of students involved appears to be dwindling.

In Pusan, South Korea's second largest city, about 250 people, most of them students, ended a week-long sit-in at the city's Catholic Center, an administrative compound of the church.

U.S. Assistant Secretary of State Gaston J. Sigur Jr. is to arrive in Seoul on Tuesday and is expected to meet with Chun, Roh and the two Kims. The United States has urged the government to resolve the crisis without violence.

It was unclear today whether the government's announcements would forestall further disturbances. Many of the student demonstrators are considered radicals who will accept nothing but the overthrow of the government.

But some observers said that Chun's more flexible attitude is aimed more at calming broader segments of Korean society who share some of the students' frustrations but may not necessarily endorse their methods.

The opposition, to a certain extent, has also been able to exploit the student demonstrations as a way of applying more pressure on the ruling party to accommodate its aims. Although a spokesman for Kim Young Sam warned that demonstrations "will be increased very severely" if a Chun-Kim meeting failed to produce any concrete results, it is not at all certain how much influence the mainstream opposition has over the students.

Despite calls for nonviolence by both Kim and the government last week, student demonstrators have continued to clash with police.

It was not clear tonight when a meeting between Chun and Kim Young Sam would take place, but both sides said it was likely within the next few days. A spokesman for Kim said Kim welcomed the offer of a meeting, but declined to characterize it as a victory for the opposition. "We must see the result of the summit meeting," he said.

The spokesman also said he would await the meeting before deciding whether to proceed with a massive peace march scheduled for Friday that is being organized with the Catholic and Presbyterian churches and Buddhist temples.

The purpose of a Chun-Kim meeting, according to observers, would be to create a change in atmosphere that might allow the two sides to resume a dialogue on the much more intractable problem of amending the constitution.

Chun agreed to meet Kim as part of a recommendation by Roh, Chun's handpicked successor, to obtain a broader range of views before announcing a package of measures aimed at ending the tensions.

State television reported that Chun met with two former presidents, Yun Po Sun and Choi Kyu Hah, who served in 1960-61 and 1979-80. These meetings, said one party official, would give Chun some flexibility to make real concessions. "Face is so important here," the party official said. "If he meets with many people, then he can say that he is responding to their demands. Otherwise, how else can he suddenly alter his {April 13} decision?"