Apparatus for data preprocessing for classifying the psychology of a game user and an operation thereof

Disclosed is an operating method of a server which analyzes a user's psychology to classify the user. The operating method includes receiving a raw database from a server of a game service provider, acquiring setup information of at least one module to acquire reference data corresponding to one of a plurality of models from the raw database, generating reference data from data of users included in the raw database on the basis of at least one module which is set on the basis of the setup information, and acquiring psychological state information of a user to be analyzed on the basis of the reference data.