A press-forming system having a press-forming apparatus press-forming a material, a user side computer performing instructions to the press-forming for the press-forming apparatus, a material characteristic database storing a material production lot number for identifying the material to be press-formed at the press-forming apparatus and material characteristic data composed of one or more selected from sheet thickness, yield stress, tensile strength, 0.2% proof stress, elongation, n-value, r-value, relational expression between a stress and a strain, hardness, temperature, surface roughness, friction coefficient and lubricant film thickness of the material to be identified by the material production lot number correspondingly, and a server side computer connected to the user side computer via a network, wherein the user side computer comprises: a material production lot number input portion inputting the material production lot number; and a material production lot number transmission portion transmitting the material production lot number input by said material production lot number input portion, wherein the server side computer comprises: a material production lot number receiving portion receiving the material production lot number transmitted by said material production lot number transmission portion, a material characteristic data encrypting portion encrypting the material characteristic data, and a material characteristic data transmission portion transmitting the encrypted material characteristic data stored in the database in correspondence with the material production lot number received by said material production lot number receiving portion, wherein the user side computer further comprises: a material characteristic data receiving portion receiving the encrypted material characteristic data transmitted by said material characteristic data transmission portion, a decrypting portion decrypting the encrypted material characteristic data, and wherein the press-forming apparatus has a punch, a die, and a blank-holder, and comprises: a process condition control portion press-forming the material with a process condition based on the material characteristic data received by said material characteristic data receiving portion. wherein the user side computer comprises: a material production lot number input portion inputting the material production lot number; and a material production lot number transmission portion transmitting the material production lot number input by said material production lot number input portion, a material production lot number input portion inputting the material production lot number; and a material production lot number transmission portion transmitting the material production lot number input by said material production lot number input portion, wherein the server side computer comprises: a material production lot number receiving portion receiving the material production lot number transmitted by said material production lot number transmission portion, a material characteristic data encrypting portion encrypting the material characteristic data, and a material characteristic data transmission portion transmitting the encrypted material characteristic data stored in the database in correspondence with the material production lot number received by said material production lot number receiving portion, a material production lot number receiving portion receiving the material production lot number transmitted by said material production lot number transmission portion, a material characteristic data encrypting portion encrypting the material characteristic data, and a material characteristic data transmission portion transmitting the encrypted material characteristic data stored in the database in correspondence with the material production lot number received by said material production lot number receiving portion, wherein the user side computer further comprises: a material characteristic data receiving portion receiving the encrypted material characteristic data transmitted by said material characteristic data transmission portion, a decrypting portion decrypting the encrypted material characteristic data, and wherein the press-forming apparatus has a punch, a die, and a blank-holder, and comprises: a process condition control portion press-forming the material with a process condition based on the material characteristic data received by said material characteristic data receiving portion. a material characteristic data receiving portion receiving the encrypted material characteristic data transmitted by said material characteristic data transmission portion, a decrypting portion decrypting the encrypted material characteristic data, and wherein the press-forming apparatus has a punch, a die, and a blank-holder, and comprises: a process condition control portion press-forming the material with a process condition based on the material characteristic data received by said material characteristic data receiving portion.