PURPOSE: To attack a menace target early and to retreat by previously advancing an attack ship, and immediately generating an attack command to the ship is appearance of the target is searched by the use of a radio detector of a warship.

CONSTITUTION: A search signal 21 is output to a display unit 7 and a target information processor 5 based on radiated radio wave from a menace target 1. This signal 21 is output from the processor 5 to other warship 2 through a communication channel 16 between communication units 18. The processor 5 calculates and analyzes characteristics of a target motion based on navigation data 12 obtained by observing the geometrical position of own warship with a navigator 8 with a remote control command 11, the signal 21 by an operator's operation on the unit 7 and a search signal 22 from other warship 2, and sends analyzed data 10 to the unit 7. A remote control command 11 such as advance, attack, retreat, etc., of a ship 15 to be attacked is output based on an operator's judgement, and tactic information 17 to the ship 15 is output from the processor 5. This is conducted through a communication channel 16 between a communication units 18 of both the warships.