TOKYO (AP) _ Japan's Ministry of International Trade and Industry summoned representatives of 10 Japanese semiconductor companies today to urge that they not sell computer chips overseas at unfairly low prices, a MITI official said.

The action came one day after the U.S. Senate unanimously approved a resolution calling for retaliation against the Japanese computer chip industry for allegedly freezing U.S. chip makers out of the Japanese market while ''dumping,'' or selling chips at unfairly low prices, outside of Japan.

Hajime Tamura, the head of MITI, told the leaders of the 10 major chip makers, including Fujitsu Ltd., Hitachi Ltd. and NEC Corp., not to dump products in third countries and to step up purchases of U.S.-made semiconductors, a MITI statement said.

The United States has threatened to back out of a chip accord, reached last July, if the Japanese side does not observe it. The deadline for a decision on whether to extend the accord is April 1.

MITI spokesman Kazuo Yokota earlier quoted Tamura as saying the ministry is ''taking seriously'' the Senate action.

The statement denied that Japanese makers are dumping chips in violation of the pact, but acknowledged that there are still some lower-priced ''gray market'' chips - ones sold by small and medium-sized Japanese trading companies instead of by manufacturers' representatives - being sold in Southeast Asian markets.

The statement did not elaborate further, but the major Japanese newspaper Yomiuri Shimbun reported that MITI has decided to urge domestic chip makers to reduce production by about 28 percent on 256-kilobit dynamic random access memories, the mainstay of chip production, during the April-June period.