South Korea's terms of trade rose in September as a fall in import prices outweighed that of export prices, ending a four-month streak of decline, central bank data showed Thursday.

The country's net terms-of-trade index for goods reached 90.37 last month, rising 0.7 percent on-year, according to the preliminary data by the Bank of Korea.

The index is calculated by dividing the index for export prices by that for import prices. The base year is 2010 with a benchmark of 100.

From a month earlier, the index rose 0.8 percent, trending higher for a second straight month, according to the data.

The country's income terms-of-trade index for September reached 118.13, jumping 8.1 percent from a year earlier.

The index measures how much can be imported with the total export value. (Yonhap)