1. A computer-readable medium storing a plurality of executable instructions that, when executed by a computer, cause the computer to implement a method for accessing object data stored in a computer system, the executed plurality of executable instructions performs the steps comprising: defining an initial context with an initial context ID in response to a connection request for a data simulation from at least one of a plurality of users, wherein the defined initial context comprises a plurality of initial entities which are copies of data objects in the stored object data; storing the context ID of the defined initial context and the plurality of initial entities in a table; receiving a request for access to at least one data object from the at least one of the plurality of users; generating a context with a corresponding context ID for the received request; acquiring a copy of at least one entity from the plurality of initial entities, wherein the at least one entity corresponds to the requested at least one data object; storing the context ID of the generated context and the acquired copy of at least one entity in the table; providing contents of the acquired copy of the at least one entity to the user requesting the access; and performing access processing, wherein access processing comprises at least one of write processing and read processing.