NTT DoCoMo Inc., the nation's biggest mobile-phone company, expects to increase its smartphone sales to more than half of the national total this fiscal year as it introduces new models, the company's finance chief said.

The market share will rise from 46 percent in the year that ended March 31, Chief Financial Officer Kazuto Tsubouchi said Friday at DoCoMo headquarters in Tokyo.

DoCoMo, the only carrier among Japan's three largest mobile-phone operators that doesn't offer Apple Inc.'s iPhone, will introduce 16 models by August, it said last week. The new ones, including Samsung Electronics Co.'s Galaxy series, will help DoCoMo win customers, Tsubouchi said.