To realize a unit sales system of an electromotive power assisted bicycle that provides a broad range of flexibility in conformity with requirements of a user, a server computer 1-1 for distributing an electromotive power assisted bicycle according to the present invention comprises a control section 1-2 for providing a general control and management of the computer, a hard disk 1-3 for storing a set of a variety of information for providing the electromotive power assisted bicycle, and a modem 1-4 enabling the connection to a variety of different terminals via a communication network. The hard disk 1-3 stores bicycle information, electromotive power assisting information, user information, physical strength/health information, a variety of different control programs to be downloaded, information about a supplier to which an order is issued, and information about an assembly station and so on. The server computer 1-1, in response to an order from the user via the communication network 1-11, creates design information for assembling an electromotive power assisting kit 1-21 with an ordinary bicycle unit having a traveling function basically provided by a pedal effort, and sends it to the suppliers and the assembler so that a tailored electromotive power assisted bicycle 1-23 can be delivered to a user.