The present invention has an object of realizing highly reliable search with high precision by obtaining a clear view image over a wide view. By applying pressure and by heating at a temperature of at most the copper recrystallization temperature, the components contained in the solution are removed except for copper, so as to elute copper oxide, thereby bonding the first bonding portion and the second bonding portion via the copper thus deposited. The address risk value and the port risk value are compared to the utility value to yield a benefit coefficient and the data packet is treated based on the benefit coefficient.