The information management device of the invention reads diverse pieces of information, for example, a printer ID and the color of toner, from a storage element of each collected toner cartridge (step S100). When the input color of toner is other than black (K), the information management device determines that an operation mode of a color laser printer is a color mode and retrieves an information management database with the input printer ID as a retrieval key (steps S110 and S120). When a retrieved operation mode of the color laser printer is a monochromatic mode, the information management device rewrites the setting of the operation mode in the information management database to the color mode (steps S130 and S140). The information management device provides each user with various services including support mail service, based on the updated information in the information management database.