A system construction section 24 receives mechanical modules, such as printer modules, and a scanner, produced by a mechanicals expendables production section 22, and assembles the mechanical modules and a built-in computer for driving and controlling the mechanical modules, so as to construct a printing system. Constructed printing systems 132, 134, and 136 are installed in a mini-labo 32, a drugstore 34, and a shopping mall 36. An expendables supply section 26 obtains a supply of expendables, which have been consumed in the respective printing systems 132, 134, and 136, from a mechanicals expendables production section 22. The supply of expendables from the mechanicals expendables production section 22, which produces genuine expendables suitable for the printer modules, ensures sufficient execution of the printing performances of the printing system.