The head of the Federal Communications Commission said Friday that his agency will not step in to freeze or roll back rising cable television prices before deregulation ordered by Congress begins next March.

FCC Chairman William Ken-nard said in a meeting with reporters that his agency would continue to study the problem, with an eye to influencing debate in Congress.Cable prices have been rising at more than five times the rate of inflation. But under the 1996 Telecommunications Act, the FCC's au-thority to regulate cable rates will expire on March 31, 1999.

"It doesn't make a whole lot of sense for us to impose a rate freeze, which I have consistently spoken against . . . or to craft a new rate regulation regime for cable not knowing whether Congress is going to continue to give us authority," Kennard said.