| 摘要 |
PROBLEM TO BE SOLVED: To realize a proper execution of service to a user by a method wherein the usage state of a supply is properly grasped. SOLUTION: The ink usage is totaled in an every predetermined period and stored renewably at the step (S1-5). The totaled result is constituted to be displayed at the step (S1-2). Thus, the ink usage during the predetermined period of time is precisely grasped, resulting in making the supply of proper amount of ink at the optimum period of time possible. Thus, the proper execution of service to a user can be realized.
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