Portable wireless communication terminal installed on a shopping cart

A method carried out by a portable wireless communication terminal, the method comprising:

• reading with a reader a commodity code that identifies a commodity to be purchased by a customer in a store;
• determining whether or not the commodity code read by the reader is associated with the store;
• determining a retrieval code based on a result of the determination about the commodity code;
• retrieving wirelessly from a database one or more pieces of information for promotion using the determined retrieval code;
• and
• displaying on a display one of the retrieved pieces of information about a commodity available for sale in the store.

A non-transitory computer readable medium storing a program causing a computer to execute a method of providing information on a portable wireless communication terminal, the method comprising:

• reading with a reader a commodity code that identifies a commodity to be purchased by a customer in a store;
• determining whether or not the commodity code read by the reader is associated with the store;
• determining a retrieval code based on a result of the determination about the commodity code;
• retrieving wirelessly from a database one or more pieces of information for promotion using the determined retrieval code;
• and
• displaying on a display one of the retrieved pieces of information about a commodity available for sale in the store.