中文摘要：

市场份额是认定经营者市场支配地位的重要因素。然而,在互联网反垄断案件中,当事人提供的市场份额数据存在较多缺陷,难以为司法机关所采信。为准确计算市场份额,需关注相关市场界定及指标的选择等问题。在此前提下,司法机关还需考虑互联网产业的特点、知识产权等其他相关因素,才能最终认定经营者的市场地位。

英文摘要：

Market share is an important factor to identify dominant position.However,in many internet antitrust cases,the market share which provided by the party as the evidence of dominant position is not regarded as trustworthy,because they are often defective.In order to correctly calculate the market share,we should solve the problem of defining the relevant market and choosing of indicators.To determine whether an internet enterprise has a dominant position,the judicial authorities should consider the characteristics of the internet industry,intellectual property,and other relevant factors besides market share.