A transaction processing system includes an application server having a transaction processing unit, a process monitoring unit, a database server having a database, and a database management unit. The transaction processing unit sends a transaction identifier for identifying the transaction to the database management unit, requests a session process, and outputs the transaction identifier to the process monitoring unit. The process monitoring unit receives the transaction identifier, receives a session identifier for identifying the session process returned by the database management unit, and sends an instruction to terminate the session process to the database management unit after a certain period of time, and the database management unit creates the session identifier, correlates the session identifier with the transaction identifier which are stored, starts the session process, returns the correlated session identifier to the process monitoring unit when receiving the transaction identifier, and terminates the session process when receiving the instruction.