It can be pronounced either way. I prefer the first one, but you will hear both pronunciations from native speakers. Most dictionaries place the middle syllable in parentheses to indicate that it's optional.
\ˈmis-t(ə-)rē\
2013년 4월 28일
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It is pronounced almost the same way as "history"
2013년 4월 28일
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By native speakers, it is pronounced both ways. Also, I have heard the word, history, being pronounced as [hɪstəri] and as [hɪstri] by native speakers of English.