The invention provides a method and an apparatus for querying data information of a DICOM image. The method comprises the steps of receiving a value of a unique key input by a user and an identifier of a current query hierarchy; sending the value of the unique key and the identifier of the current query hierarchy to a server, receiving query data returned by the server, and writing the query data in a predefined data type; if a query key of a next hierarchy of the current query hierarchy in the data type is not written with a value, continuing to perform a query, until a query value of a fourth hierarchy in the data type is written with a value; and displaying the values of the query keys of the current query hierarchy to the fourth hierarchy. Under the condition that the user only selects the query hierarchy once and inputs the value of the unique key once, a comprehensive query is realized and the values of the query keys of the current query hierarchy to the fourth hierarchy is displayed, so that the user operation is simplified and the query efficiency is improved.