An account-settling system comprises a buyer-side facsimile apparatus and a seller-side facsimile apparatus. These facsimile apparatuses are connected to the Internet through LANs, respectively. The buyer-side facsimile apparatus comprises, in addition to a facsimile section, an operation section, an apparatus-status monitoring section, a notice data generating section, an SSL encoding section, an HTTP client section, a TCP/IP protocol control section, and a network control section. The HTTP client section is an Internet-connecting unit. The buyer-side facsimile apparatus is connected to the LAN. The operation section is operated to input the account data representing the number of the buyer's credit card and the validation period thereof. The apparatus-status monitoring section detects the amount of any expendable that remains in the facsimile apparatus. The notice data generating section supplies account data and expendable-type data to the seller. The SSL encoding section encodes data, thereby keeping the data secret. The seller-side apparatus includes an operation section, a storage section, a notice data analyzing section, an SSL decoding section, an HTTP server section, a TCP/IP protocol control section, and a network control section. The notice data analyzing section analyzes the notice data received through the Internet from the buyer-side facsimile apparatus and performs settlement based on the analyzing result.