Disclosed are an apparatus for detecting a workshop account, which performs cross-validation of a workshop detection result to acquire a high reliability result, and a method thereof. According to the present invention, the apparatus for detecting a workshop account comprises: an I/O interface receiving an input for a game program, in which an item transaction is performed in an exchange, from a terminal; a memory storing a game log related to the input for the game program; and a processor outputting a doubtful workshop account group based on the game log of the game program. The processor extracts a macro account from the game log based on a delay sequence formed with a plurality of input delays to select a farmer account, extracts a seller account based on a transaction amount for an article, extracts accounts related to transaction particulars between the farmer and seller accounts, and outputs a workshop account group based on the related accounts.
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