In a system for endoscopic surgery 3, a storage unit 50 stores a command for controlling a peripheral device and whether or not the command is valid or invalid in an associated manner for each operator and each procedure of an endoscopic surgery. A display I/F 51 receives specification of an operator and a procedure. An input voice signal conversion unit 62 recognizes an input voice, and converts the voice into a character string. A voice recognition determination unit 59 refers to the storage unit 50, and determines whether or not the character string obtained by the input voice signal conversion unit 62 is identical to a command that has been set to be valid for the operator and the procedure specified by the display I/F 51. A control unit 41 halts a transmission process to a peripheral device that corresponds to a command that has been determined to be invalid by the voice recognition determination unit 59.
